author's abstract of this paper issded 

 bt the bibliographic service, march 8 



GEOGRAPHIC VARIATION AND MENDELIAN 

 INHERITANCE 



FRANCIS B. SUMNER 



SEVEN FIGURES 

 INTEODUCTION AND SUMMARY OF RESULTS 



In several previous papers^ I have reported upon the results 

 of a biometric and genetic study of the geographic races of a 

 single species of deer-mouse (Peromyscus maniculatus) found 

 within the State of California. The present paper, like the 

 former ones, is merely a report of progress. I shall here discuss 

 the more important additions to my previous findings, based 

 upon the work of the last two years. I shall, however, make 

 only incidental reference to certain prominent phases of this 

 work, such as the study of the various color mutations which 

 have appeared and the field studies of environmental conditions. 

 These will be embodied in separate papers, to be published before 

 long by Mr. H. H. Collins and myself. 



Thus far, collections sufficient for statistical purposes have 

 been made in eight different localities and minor collections at 

 five or six others. Over three thousand animals, wild and cage- 

 born, have been subjected to measurement. Only wild speci- 

 mens, unmodified by captivity, have been dealt with in com- 

 puting the differences between the various races here discussed. 



The characters chosen for study have been, as far as possible, 

 ones which are capable of quantitative expression. As empha- 

 sized in earlier papers, the methods employed have been stand- 

 ardized, so as largely to eliminate differences due to irrelevant 

 circumstances and to 'personal equation.' What these charac- 

 ters are will appear in the ensuing pages. Most of them have 



1 American Naturalist, November, 1915; id., March, 1917; Genetics, May, 1917; 

 Bulletin of the Scripps Institution, No. 3, October 19, 1917; American Naturalist, 

 April-May, June- July, August-September, 1918. 



369 



