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The attempt to reconstitute the pluvial and arid periods of Saharan Africa finds, in the Hoggar region. vestiges of what may be humid and dry periods in alternation. It is apparent that the humid periods for the lowland country derive from the extension northward of tropical conditions but that, on the other hand, the humid periods in the highlands are related to the southward spread of mediterranean climatic conditions. Evidence is presented that the Quaternary opens with a warm and humid episode during which tropical fauna extend northward and reach to fairly high elevations, which period may possibly be identified with Lower Villafranchian in the archeologic scale. A drying-out period was followed by a cooler humid period during which the higher mountains show the spread of mediterranean mountain flora (Upper Villafranchian), terminating in at least one period of wet-cool conditions making for solifluction and frost-cleaving. Middle Quaternary conditions suggest an arid period of sand dune accumulation followed by a more moist period in which a tropical fauna again extends northward (Upper Acheulian). Upper Quaternary shows an arid period followed by a short moist period in which savanna flora and fauna spread at the lower elevations and a more xerophilous mediterranean flora and fauna spread though the highlands (Moustero-Aterian). The alternation of climatic periods is not fully regular, and there are many problems remaining in the interpretation of climatic, floral, faunal, and human occupance sequences, but a progressive drying-out does seem indicated. [ABSTRACT FROM AUTHOR]

This is a study of the physiography of the Republic of Kenya. It shows that the country has a diversified landscape which so far, has not been given a serious geographical analysis. The existing physiographic maps are reviewed and found to be far too generalized to be of much practical value. a detailed physiographic map is presented based primarily on landform genesis. From the map, one can appreciate the various landscape types in Kenya as well as the forces that have produced them. Fourteen major physiographic regions are suggested, each being further sub-divided into a number of sub-regions. The final map looks complicated, but the author shows that this careful, detailed scrutiny is necessary for the deeper understanding of the physical environment. [ABSTRACT FROM AUTHOR]

Discusses the coastal geomorphology of Majorca, an island in Spain. Divisibility of the large-scale morphology of the Balearic Islands to two basic structural units; Description of the physiographic characteristics of the areas; Association of cliff coasts with deeper waters offshore.

Analyzes the equation used to derive the flow velocity from antidune wavelength for open-channel conditions in cloridorme formations in Gaspe Peninsula, Quebec. Calculations based on the modified equation; Indications of a much higher flow velocity.

Focuses on the geographic cycle in periglacial regions as it is related to climatic geomorphology. Morphogenetic regions; Normal cycles.

Focuses on William Morris Davis' concepts of slope development viewed in the light of quantitative investigations. Study of slope problems.

Focuses on the place of geomorphology in the geographic sciences. Methods of teaching the elements of physical geography; Geomorphology as a part of geography.

Focuses on the methods used by geomorphologist William Morris Davis. Career history; Contributions to geomorphology; Achievements.

Profiles geomorphologist William Morris Davis. Personal background; Career history; Achievements.

Focuses on the implications of the decline of the interest in physical geography for the progress in geography in the U.S. Expansion of the field of geography; Development of geomorphology; Plan of the Geological Society of America to establish a Division of Geomorphology.

Focuses on the role of physical geography in the training of the geographer. Interests on the essentials of physical geography; Consideration on biological influences; Disciplines in physical geography.

Delves into the nature and origin of the topographic features of the Rhône Delta. Identification of the different definitions of deltas according to various scientists; Discussion of the place's regional geology; Description of the lower Rhône valley.

Profiles William Morris Davis, leader in geomorphology and geography. Career development; Work in meteorology;Work in geology; Work in geomorphology; Work in other phases of geography; Professional standards.

Explores the physiographic divisions of the U.S. Explanations concerning the need of natural divisions; Details of the work of the Association of American Geographers; Account of the designation by professor W. M. Davis of dominant factors in topography.

The article presents various titles and abstracts of research papers related to geography by the Association of American Geographers. Some of papers included are "Problems of Geographic Influence," by Albert Perry Brigham, "Some Geographic Factors Influencing Brazilian Trade," by Walter S. Tower, "Postglacial Migrations of Vegetation in the Middle West," by Henry Allan Gleason, "Bases for Dividing the United States into Physiographic Provinces," by N. M. Fenneman, "The Losses of Nebraska," by G. E. Condra.

The article brings together certain principles of geographical description, like, physiographic topics, and ontographic topics. The nature of analytical and systematic studies of land forms in their relation to regional accounts of land forms, is discussed. The analytical and systematic studies are equally useful in other divisions of geography in preparation for regional treatment. According to the author, the description of existing landscapes, districts, and regions of the earth's surface is the goal toward which other phases of geographical study, whether presented as personal narrative, historical review, analytical discussion, or systematic arrangement, all lead.

The article focuses on The Conference on the Delineation of Physiographic Provinces in the United States, held by the Association of American Geographers. The purpose of this round table conference was to afford opportunity for a free discussion of the problems involved in the division of the area of the United States into physiographic provinces, with a special view to ascertaining whether collaboration in that work by a number of geographers under the leadership of a committee of the association might prove advisable and practicable.

Focuses on training in the field of geomorphology. Graduate work in geography; Physiography of the U.S.

Focuses on quantitative analysis of landforms. Use of mathematical formula and statistical analysis; False impression of objectivity.

Highlights the 1950 Symposium on Geomorphology in honor of the 100th anniversary of the birth of William Morris Davis. Six papers presented in the symposium.