TEMPERATURE AND EMBRYONIC DEVELOPMENT li^5 



It seems poasitle to expand the normal temperature range by artificial means (Lillie 

 and Knowlton, I896). Eggs of any species, reared at low normal temperatures, will toler- 

 ate the auh-normal temperatures hetter than other eggs reared at higher, hut normal tem- 

 peratures. The range of Bufo lentiginosus was increased by as much as 5'5°C. hy such ac- 

 climatization (Davenport and Castle, I896). DuShane and Sitchinson (19^4-1) have demon- 

 strated that the development of form and the development of behavior are differentially 

 affected by temperature differences. 



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"// there be a better way of securing understanding than 

 by the method of science, human history and human experience 

 have not yet revealed it. " 



A. J. Carlson 



