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By M. Demerec (Ed.)

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Bourlihre, D. , 1951, Vie et moeurs des mammiferes. Payot, Paris, 250 pp. , 1940, Territorial behavior and populations of some small, mammals in southern Michigan. Misa. Publ. Mus. Univ. Mich. 46, 1-58. 1943, Territory and home range concepts as applied to mammals. J. Mammal. 24, 346-352. 1949, Territoriality. J. Mammal. 30, 25-27. , 1948, Mortality and movement of brown rats (Battue norvegicus) in artiflcially supersaturated populations. J. Wildlife Manag. 12, 167-172. Chitty, Dennis, 1937, A ringing technique f o r small mammals.

The protection accorded to the lethals diminishes as their distance from the dominant gene increases. Consequently, the rare homozygotes in a polymorphism tend to become inviable, and the process is a cumulative one, since such inviability augments the shelter given to the lethals. Therefore, in Fz segregations it is usual to obtain a n approach to a 2: 1 ratio when a 3 : 1 ratio is expected. Moreover, it is frequently found in breeding such polymorphic forms that the raxe homozygotes are delicate, infertile, or nearly unobtainable, but that occasionally homozygous individuals approaching normal viability appear.

1939, An estimate of the population of deer-mica in the Black Rills of South Dakota and Wyoming. Contr. Lab. vert. Genetics Univ. Mich. 10, 1-5. 1942, Ecological distribution of Peromyscus and Neotoma in parts of southern New Mexico. Ecology 23, 199-208. , 1946, Some notes on the life history of the Mexican ground squirrel in Texas. J. Mammal. 27, 105-115. , 1949, Summer populations and movements of the cotton rat and other rodents on the Savannah River Refuge. J. Mammal. 30, 133-140. , 1939, Reactions of muskrat populations t o drought.

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