References 367 



Rubey, W. W. 1955. Development of the hydrosphere and atmosphere, 

 with special reference to probable composition of the early atmos- 

 phere. Geol. Soc. Amer., Spec. Paper 62:631-650. 



Rudd, R. L. 1955. Population variation and hybridization in some Cali- 

 fornia shrews. Syst. Zool. 4:21-34. 



Runcorn, S. K. 1959. Rock magnetism. Science 129:1002-1012. 



Ruzicka, V. 1919. Restitution und Vererbung. Vortr. u. Aufs. iiber Entw.~ 

 mech. d. Org., H. 23. 



Sabrosky, C. W. 1952. How many insects are there? U. S. D. A. Yearbook 

 Agric, 1952:1-7. 



Sager, R. 1960. Genetic systems in Chlamydomonas. Science 132:1459- 

 1465. 



Sailer, R. I. 1954. Interspecific hybridization among insects with a report 

 on crossbreeding experiments with stink bugs. J. Econ. Ent. 47:377- 

 383. 



Sandage, A. R. 1956. The red shift. Scient. Amer. 195(3): 170-182. 



Sanger, F. 1959. Chemistry of insulin. Science 129:1340-1344. 



Sanjean, J., and B. V. Travis. 1955. An eight-legged flea, Orchopeas 

 howardi howardi (Baker). J. Parasitol. 41:636-637. 



Sauer, J. 1957. Recent migration and evolution of the dioecious amaranths. 

 Evolution 11:11-31. 



Savile, D. B. O. 1956. Known dispersal rates and migratory potentials as 

 clues to the origin of the North American biota. Amer. Midi. Nat. 

 56:434-453. 



Schmalhausen, I. I. 1949. Factors of evolution. The theory of stabiHzing 

 selection. Blakiston Co., Philadelphia. 



Schoof, H. F. 1952. House fly dispersion studies in metropolitan areas. 

 J. Econ. Ent. 45:675-683. 



Schrodinger, E. 1953. What is matter? Scient. Amer. 189(3) :52-57, 168. 



Schuchert, C. 1924. A textbook of geology. Part II. Historical geology. 

 2nd rev. ed. John Wiley & Sons, Inc., New York. 



. 1955. Atlas of paleogeographic maps of North America. John 



Wiley & Sons, Inc., New York. 



Scott, T. C, and W. D. Klimstra. 1955. Red foxes and a declining prey 

 population. Southern 111. Univ. Monog. Series 1:1-123. 



