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Stone pavements arc armored surfaces comprising intricate mosaies of coarse particles, usually only one or two stones thick, set on or in fine material. They occur widely in many unvegetated areas, and preeminently in hot deserts. Pavement studies in several deserts, and especially in Chile and California, suggest that: 1) deflation may be a relatively unimportant process of pavement formation; 2) running water, and processes causing upward migration of coarse particles through the soil may effect coarse particle concentration at the surface; 3) various superficial disintegration processes may break up coarse particles and increase particle density; 4) the ways in which pavements are established, their rates of formation, and the relative importance of the different processes, may vary greatly from place to place. [ABSTRACT FROM AUTHOR]

Examines the role of the United States federal Constitution Congress to regulate commerce with foreign nations and among several states within the country. Explanation of why the word "commerce" stipulated by congress is substantially synonymous with "transportation"; Source of authority to engage in interstate transportation under conditions of special privilege; Doctrine of the exclusiveness of the power of congress under the Commerce clause suggestive of the conclusion that such authority may not be derived from the states.

Examines whether there is a conflict between the power of the United States Congress and the states in the control of corporations engaged in commerce or transportation. Power of Congress over federal corporations; Power of states over federal corporations; Power of Congress over state corporations; Power of the states over domestic and foreign state corporations; Comparative advantages of state and federal incorporation.

Offers information on a research study on the residency training experiences of practicing pediatricians in the U.S., conducted by the Committee on Pediatric Research, Education and Practice of the Institute of Pediatric Residency Training. Assessment of the pediatric research expenditures; Approaches used in the evaluation of residency training; Variations in the staffing of residency programs.