4 Tram. Acad. Sci. of St. Louis. 



of their lives cannot possibly be influenced by insufficient 

 or improper food. One might naturally suspect that the 

 conditions of confinement would be a factor in curtailing 

 or prolonging life, but all the functions seemed to pro- 

 ceed in so normal a manner that we have little reason to 

 think that this is the case. Thus this material offers a 

 very unusual opportunity of obtaining for this study an 

 organism which passes through practically all of its de- 

 velopment in its native habitat, unrestrained, and may 

 finish its feeding and then may be brought together from 

 various regions in the experimenter's laboratory. Many 

 animals do not have this clearly defined boundary be- 

 tween adolescence and adulthood. 



The groups of material used are as follows : 4 



Year Insects 



Philosamia cynthia Philadelphia 1913 208 



Philosamia cynthia New York 1913 151 



Telea polyphemus New York 1912 35 



Telea polyphemus St. Louis 1913 92 



Telea polyphemus Augusta, Ga 1913 351 



Telea polyphemus Fall River, Mass 1913 174 



Telea polyphemus Augusta (cellar) 1913 66 



Callosamia promethea Fall River, Mass 1913 104 



Samia Californica Sonoma Co., Cal 1912 12 



Samia cecropia River des Peres (normal) 1913 220 



Samia cecropia River des Peres (fluffy) . . 1913 74 



Samia cecropia South St. Louis 1913 142 



Samia cecropia New York 1913 110 



Samia cecropia Fall River, Mass 1913 9 



Samia cecropia River des Peres (cellar) . . 1913 42 



Samia cecropia South St. Louis (cellar).. 1913 38 



Samia cecropia River des PSres (house) . . 1912 69 



These notes on longevity then were made on 17 lots of 

 material comprising 1897 individuals. In addition to 

 this, observations were made upon reproductive phe- 

 nomena in their relation to longevity. 



4 This material was obtained from Mr. J. J. Wirz of Augusta, Ga., 

 Mr. Norman S. Easton of Fall River, Mass., Mr. Jesse Lund of New 

 York City, and Mr. George H. Hosenfeld of St. Louis. 



