2 Trans. Acad. Sci. of St. Lowia. 
hand which is the primary and which the secondary func- 
tion, whether the length of life depends upon the rate of 
increase, or the rate of reproduction depends upon the 
length of the generations—in other words, whether ap- 
proaching death incites reproduction, or reproduction 
causes death. 
We desired to get at the principles of the duration of 
life from the standpoint of their efficiency for the per- 
petuation of the species. Hence we made an extensive 
study of the longevity of Saturniid moths, with a view to 
ascertaining just what relationship exists between the 
longevity and environment and the function of reproduc- 
tion. These pages embody the results gleaned from the 
records kept of a large number of individuals of several 
species for a number of seasons, and from several local- 
ities. 
The data are presented in the following sequence :? 
INTRODUCTION. 
LONGEVITY. 
PHILOSAMIA CYNTHIA, 
DISCUSSION OF LONGEVITY. 
LONGEVITY UNDER CONDITIONS OF LOWERED TEMPERATURE. 
OvreosttTron, 
NUMBER OF EGGS CARRIED, 
COMPLETENESS OF OVIPOSITION. 
AGE WHEN FIRST EGGS WERE DEPOSITED. 
AGE AT WHICH THE GREATEST NUMBER OF EGGS WERE DEPOSITED. 
LAPSE OF TIME BETWEEN LAST OVIPOSITION AND DEATH. 
PROPORTION OF SEXES. 
THe Priornrry or MALE EMERGENCE, 
Tue Feermiry or SATURNIDD cis IN RELATION To THE MATine Prrtop. 
INTRODUCTORY REMARKS. 
SAMIA CECROPTA, 
EEE Be Me Bo ene 
2Sinee it is not customary for 
the Academy to publish a table of con- 
tents of its articles, we hope that this syllabus may se rpos 
of locating each unit. ee . 
