198 



BIBLIOGRAPHY. 



V. EVOLUTION. 1 



1871. 



1. Mammals and Winter Birds of East Florida, etc. <Bull. Mus. Corny. Zool., II, 

 No. 3, pp. 161-450, April, 1871. 



Part III. On Individual and Geographical Variation among Birds, considered in respect 

 to its bearing upon the Value of certain assumed Specific Characters, pp. 186-250. 



Wide range of individual variation shown to occur in a considerable number of species, 

 with extensive tables of measurements, pp. 186-226; correlation of variations in general size, 

 size of bill, etc., and in coloration, with differences in climatic and geographic conditions, pp. 

 229-242; species, varieties, and geographical races, pp. 242-250. A presentation of facts, 

 without discussion of any theories of evolution, which appeared later (see infra, No. 7). 



1872. 



2. Notes of an Ornithological Reconnaissance, etc. <Bull. Mus. Corny. Zool., Ill, 



pp. 113-118, July, 1872. 



In the introduction the general subject of geographical variation is discussed and new 

 facts presented. 



3. Geographical Variation in Color among North American Mammals and Birds. 



<Proc. Boston Soc. Nat. Hist., XV, 156-159, Sept., 1872. 



Abstract of a verbal communication, summarizing the general subject, with comment by 

 other speakers. 



4. Geographical Variation in North American Birds. <Proc. Boston Soc. Nat. Hist., 



XV, pp. 212-219, Dec, 1872. 



A general resume of the author's studies of the subject, to that date. (Bepublished in 

 Amer. Na!., VIII, pp. 534-541, Sept., 1874). 



1874. 



5. Geographical Variation in Color in North American Squirrels. <Proc. Boston 



Soc. Nat. Hist, XVI, pp. 276-294, May, 1874. 



The introductory matter (pp. 276-286) relates to this subject. See especially the footnote 

 to pp. 277, 278, giving references, etc., to previous discussions of the general subject of geo- 

 graphical variation in mammals and birds by the author and others. 



1876. 



6. Geographical Variation among North American Mammals. <Bull. Geogr. and 



Geol. Surv. Terr., II, No. 4, July 1, 1876, pp. 309-344. 



The correlation of size with geographical variation is formulated (p. 310) under the three 

 propositions: 



" (1) Maximum physical development of the individual is attained where the conditions 

 of environment are most favorable to the life of the species .... 



i Exclusive of numerous incidental references in many general papers and reviews. 



