The sulphur, in form of powder, was run in a thick layer all over 

 the bottom of the jar and was then covered with the moss litter. 

 To be sure that vapour of S0. 3 was given off the jar was from time to 

 time placed in a little hot water, or a little sulphur was burnt in it. 



Now, in giving you the results, four important points will be 

 especially noticed: The number of normal imagines ; the number of 

 cripples ; the colour changes in the wings ; the number dead. 



The following are the details of the experiments : 



Physical Conditions. 



Water. 



Vanessa nrticte. 

 Total number. Hatched. Cripples. Died. 



123 67 28 56, or 45 per cent. 



You will see that several of the butterflies were cripples. 

 The colour of the wings was, in a few instances, a little less bright 

 than the controls. 



A, grossulariata. 



Total number. Hatched. Crippled. Died. 



147 15 4 132, or 90 per cent. 



The pupas were very much affected by the moisture, as the above 

 figures show, the death-rate being exceedingly high. No special 

 change, however, was observed in the colour of the wings. 



98 - 4° Fahrenheit. 



V. urticce. 

 Total number. Hatched. Cripples. Died. 



103 20 7 83, or 80 per cent. 



The high death-rate here given is really not sufficiently accurate, 

 as thirteen of the twenty that emerged came out within twenty-four 

 hours of being introduced into the incubator, which probably means 

 that they were so nearly mature that the temperature had but little 

 opportunity to act on them. 



Omitting the twenty the figures would have been : 



Total number. Hatched. Cripples. Died. 



83 7 2 76, or 91*5 per cent. 



This shows that the continuous high temperature acts very un- 

 favourably on these pupae. No colour changes were noted on the 



butterflies. 



A. grossulariata. 

 Total number. Hatched. Cripples. Died. 



9 1 o o 91, or 100 per cent. 



