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The article presents abstracts of the papers presented at the 63rd annual meeting of the Association of American Geographers, Saint. Louis, Missouri. The meeting took place in April 1967. The paper "Defense and the Morphology of Certain Settlements in the Western Mediterranean," discusses economic growth. Another paper "Approach to a Generating Model for Climatic Statistics," discusses a set of probability models for generating climatic statistics. After a brief review of previous work on this subject, a model based on moving waves superimposed, on standing waves in the zonal winds is outlined.

Presents abstracts of research papers and speeches on geographic study. Erosion cycle in a rugged mountain region and changes in settlement patterns at the eastern Canadian Arctic; Contributions of U.S. scientists to the geographic knowledge of the Central Pacific; Establishment of a unique climatic study.

Presents abstracts to articles presented at the 1948 annual meetings of the Association of American Geographers in Madison, Wisconsin. "Geographical Work in the Bureau of the Census," by C. E. Batschelet; "Delimitation of Urban Areas for the 1950 Census," by Margery D. Howarth and August J. Nogara; "Some New Climate Maps of China," by Charles Y. Hu.

The article presents observations on microclimate and vegetation interrelationships on the Accra Plains in Ghana. The paper aims to shed light towards a better understanding of microclimate and its interrelationships with the vegetation of the southern savanna zone in Ghana which was known as the Accra Plains. It carried out a measurement of microclimate and transpiration during a complete 24 hour period during the dry season. It set up seven microclimatological stations in a characteristic tree and shrub clump and the surrounding grassland.

The article presents abstracts on agricultural and climatological topics which include the study on the flora of the Athabasca-Great Slave region in Canada, the study on the vegetation situated at the eastern extremity of Great Slave Lake, Mackenzie, and the analysis of the indigenous American species of Lithospermum, with an enumeration of the species and varieties.

The primary purpose of this paper is to analyze the "determinants" of migration between Standard Metropolitan Statistical Areas (SMSA's) in the United States. The magnitudes in which various factors have influenced inter-SMSA migration are estimated both for the country as a whole and for individual SMSA's. The "migration elasticities" estimated for individual SMSA's are in turn used to test several additional hypo- theses concerning migrant behavior. Other similar migration studies have found "wrong" signs or insignificant coefficients on certain variables a priori thought to play a crucial role in the migration process. Finally, we present clues to the causes of such "surprising" results. [ABSTRACT FROM AUTHOR]

Focuses on written structures for presenting the geography of regions. Forms, such as land forms, observable climatic phenomena, drainage conditions, soil character and character of vegetation; Pattern, such as land form arrangement, vegetation pattern; Association, such as drainage form and pattern in their physical relation to the land form and pattern; Principal method description.

This treatise is a summary of the temperature aspect of climate only. Concise statements of the ways in which certain aspects of climate differ from place to place are given in some texts and treatises dealing with meteorology and climatology. The aim of this paper is to point out and explain those relations which correspond, in so far as the nature of the subject permits, to the laws of other sciences. Some of the "laws" that have been included are, laws concerning the heating and cooling of the earth, distribution of heat in point of time, distribution of heat over the earth, delay of heating and cooling, diurnal range and seasonal range.

This paper presents procedures whereby the symbolization of Thornthwaite's climatic classification may be quickly and accurately determined by use of graphs and nomograms. Potential evapotranspiration adjusted for months and latitude of the station is accomplished graphically. Soil water storage, soil water deficiency, and soil water surplus are determined by the Thornthwaite accounting procedure and, once determined, the symbolization for the complete climatic designation of the station is obtained by further graphical means. [ABSTRACT FROM AUTHOR]

In this paper harmonic analysis is employed to investigate regional variations of the annual march of precipitation over Canada. In order to examine the regional variations of the annual march of precipitation, the researcher is confronted with the problem of presenting variations of space as well as time. A method of objectively describing and mapping these space-time characteristics of precipitation is that of harmonic analysis. Before proceeding to examine the area distribution of the two major variance components, the annual and semiannual, it is useful to establish the distribution of the total variance and also the relationship of the two major components to the total variance and to one another.

Presents a reply to the comment of the article written by John E. Oliver entitled "A Genetic Approach to Climatic Classification," previously published in "Annals of the Association of American Geographers." Selection of poor examples in the quest for stations that do not fit the scheme suggested in the paper; Questionability on the usage of short-term and old data in any climatological analysis; Role played by air masses in maritime origin in the determination of the summer climate of some continental stations.

It is well known that textile fabrics lose strength when subjected to unprotected outdoor exposure, and the amount of strength lost for a given period of time, or for a given number of sun-hours as measured by the Campbell-Stokes apparatus, may vary considerably according to the nature of the fibre and to the climatic conditions prevailing at the exposure site. From data recorded at eight exposure sites in the United Kingdom during 1961 and 1962, it is possible to draw certain conclusions. Thus, in rural areas, such as Pontypool (Mon.), Invergowrie (Perth), and Carlton (Durham), where 'clean' or unpolluted atmospheres might be expected to exist, an 11-oz/yd² cotton duck was found to be more resistant than either a 10½-oz/yd² nylon or a 14-oz/yd² Terylene fabric. In semi-rural areas, such as Lanark and Farnborough (Hants.), 11-oz/yd-²cotton duck appeared to be as resistant as Terylene. It was only in urban areas, such as Didsbury and Droylsden (Lanes.) and Bradford (Yorkshire), that cotton was found to be inferior to Terylene and to a less extent to nylon. The 16-oz/yd² cotton fabric was found to be more resistant than the 11-oz/yd² one. [ABSTRACT FROM AUTHOR]

The article presents a study on the light reaching the ground vegetation in the high forest phase and its relation on the differences in forest structure of two selected sites, where one is on the slopes of Mount Andes and the other is at the extreme western edge of the Amazon basin. The authors state that their observations and analysis have enabled them to associated some of the differences between the two forests with differences in light climate. They mention that the interactions between light and other factors, specially root competition, may be very important. They believe that future studies on light as an ecological factor in tropical forests will most productively be aimed to the reaction of individual species to light at various stages of growth.

The article presents an environmental analysis of the savanna vegetation in Northern Nigeria. The study indicates that soil parent material is not a major factor in the arboreal vegetation of an area. It reveals that the main factors are the water availability in the soil and the degree of human interference. The factors control the general ordination of both noda and groups, soil water and human interference. Moreover, the general case differences in soil parent material do not necessarily imply differences in the arboreal vegetation.

The article discusses a study of the winter annual Teesdalia nudicaulis which is based on field observations in the East Anglian Breckland in England and on pot experiments. The monthly means of some climatic factors which are recorded in or near the Breckland are shown. It considers in more detail the soil moisture likely to be experienced by Teesdalia in the Breckland during late winter, spring and early summer. Careful excavation of root systems showed that the roots of almost all Teesdalia plants growing on undisturbed soil are confined to the top 4 centimeters of soil.

The article presents abstracts on agricultural matters which include the study of the South African Grasses, the descriptions given by R. H. Compton, L. Bolus, N. S. Pillans, and D. Weintroub to various species belonging to several genera, and the study of the influence of the winter season upon the nitrogen and carbohydrate mechanism of various plants.

The article presents abstracts on agricultural and climatological matters which include the study on some of the forest diseases observed during a pathological reconnaissance of the forests of Nova Scotia, the analysis of a collection of plants gathered at 20 various stations along the southern and central parts of Austin, Texas, and the examination of habenaria obtusata that is considered a common plant of the Canadian forest from Newfoundland to Alaska.

The article presents abstracts on agricultural and climatological topics which include the taxonomy, morphology and development, and phenology of Zostera marina that can be found along the Atlantic coast of North America, the analysis of the genus Helianthus, and the study of the materia medica of four tribes of British Columbia, which are Bella Coola, the Gitksan, the Carrier, and the Sikani.

The article examines the relation of evaporativity to plants and animals. It investigates the conditions determining rates of evaporation from organisms in freezing weather. It discusses some new arrangements whereby porous-porcelain atmometers may be guarded from frost injury in short period of freezing weather. The experimentation was carried out at the Laboratory of Plant Physiology of the Johns Hopkins University in Baltimore, Maryland during the winter of 1927 to 1928. It emphasizes that direct measurement of evaporation in freezing weather may be based on the vaporization of either liquid or solid water.

The paper gives a short account of some hydroclimatical factors and their importance for the habitants of arctic and alpine lakes. The differences in distribution of solar energy are briefly discussed. Few examples of plankton communities in arctic and alpine lakes are given together with some remarks about the geographical distribution of plankters. [ABSTRACT FROM AUTHOR]

Fourier and spectral analysis of rainfall records at 163 South African stations over the period 1910-1969, and at thirty-nine stations from 1880–1969, shows that cyclical fluctuations with periods of about 18–20, 13–15, 10, 4.5, 3.5, 2.8, and 2.3 years account for much of the observed rainfall variance over the country. These fluctuations exhibit distinctive regional distributions that appear to have changed little over the last century. [ABSTRACT FROM AUTHOR]

Colluvial mantles on the mountains of southwestern United States are believed to have formed during colder climates associated with the last glaciation. They imply mean temperatures 10-11°C. lower than those of today and a depression of the timber line by 1,300-1,400 meters. Evaporation rates were about half the present values and by estimating runoff it is possible to reconstruct the full-glacial hydrologic budget of Pleistocene closed lakes. Precipitation was eighty to ninety percent of present values and there was no glacial pluvial. Pollen data can be reconciled with the proposed cold dry climate which has modem homoclimes at higher altitudes and latitudes. [ABSTRACT FROM AUTHOR]

Examines the complexity and dynamics of climatology. Investigation of the three climatic methodologies; Distinction between dynamic and synoptic climatology; Description of climates.

Focuses on the nature and origin of the Canadian Dry Belt, dry regions in the Great Plains of North America. Measurement of annual precipitation; Variability of precipitation; Classification of climate.

Discusses the climatic maps of proper China and Manchuria according to the Thornthwaite 1948 classification. Formula for computing the potential evapotranspiration; Presentation of climatic conditions; Classes of maps presented by Thornthwaite.

Discusses some of the methods whereby the climatological record is being put into a shape more valuable to the meteorologist and the regional geographer. Synoptic climatology; Problems of a quantitative treatment; Statistical specification of the pressure pattern.

Examines the regional differences in the world atmospheric circulation. Description of the geographic pattern of climate; Separation of boundary zones; Generation of climatic gradient in the moving air by factors which tend to produce a steep weather.

The article presents information on professor J.R. Harman's article concerning climatic conditions in relation to forest differentiation. According to the author it includes several misleading and questionably relevant statements and some rather incongruos conclusions. Most of the emphasis in the paper has been placed on climatic conditions during the summer months. It is a rather serious oversight since the spring months of May and June comprise most of the height growth season of sugar maple and beech and probably all of the height growth season of black oak.

The article analyzes the role of U.S. government the development of weather modification programs. The federal government should enunciate national policies concerning weather modification activities within the country. The ultimate goal of weather modification would be the ability to control weather phenomena affecting the safety and economy of national activities. In addition, the government should promote research leaning to the description, prediction, and development of capabilities in modification of the atmosphere.

Comments on the article written by John E. Oliver entitled "A Genetic Approach to Climatic Classification," previously published in "Annals of the Association of American Geographers." Utilization of air mass in meteorology; Importance of air mass as a device for summarizing several kinds of information about atmospheric environment; Alleged inability of Oliver's paper to establish the value of air masses.

Comments on the article written by John E. Oliver entitled "A Genetic Approach to Climatic Classification," previously published in "Annals of the Association of American Geographers." Remarkable features on the genetic approach of Oliver to climatic classification; Determinants of air mass provenance; Illustration on the weakness of the classification; Expectation on a scheme that classifies air masses by temperature without regard to the season of the year.