BIBLIOGRAPHY AND AUTHOR-INDEX 415 



DOBZHANSKY, T. 1927. Studies on the manifold effects of certain genes in 

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D. pseudoohscura hybrids. Gen. 21. 283 

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 and KOLLERj p. 1938. Sexual isolation between two species of Drosophila. 



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and SCHULTZ, j. 1934. The distribution of sex factors in the x chromo- 

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D. miranda. Z.I.A.V. 72. 267 

 and QUEALj M. L. 1938. Genetics of natural populations. Gen. 23. 286 

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 and siDEROV, b. n. 1934. Relation between the effect of a gene and its 



position in the system. Am. Nat. 68. 168, 375 

 and SOKOLOV, n. n., and tiniakov, g. g. 1936. Occurrence and distribu- 

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 DUERDEN, J. E. 1920. The inheritance of the callosities in the ostrich. Am. 



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 DUNCAN, H, G. 1 929. Race and population problems. London. 351 

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 1934. Analysis of a case of mosaicism in the house mouse. J. Gen. 29. 86 



