In this species the total number died. This result must, I think, 

 be attributed to the temperature only. I was most careful to avoid 

 either excessive humidity, which would have caused decomposition, 

 or excessive dryness, in which they must have perished from extrac- 

 tion of water from their bodies. That temperature alone should be 

 so fatal I was not prepared for. I do not know whether continuous 

 high temperature acts in the same way on other species. 



Chemical Conditions. 

 Nitric Acid. 



V. uriicce. 



Total number. Hatched. Cripples. Died. 



166 64 22 102, or 61 per cent. 



A large number of urticcc died in pupre, and a third of those that 

 emerged were cripples ; those that developed their wings showed 

 little if any change in colour. 



A. grossidariata. 



Total number. Hatched. Cripples. Died. 



140 82 15 58, or 41 per cent. 



The mortality was somewhat above the controls, but not very 

 noticeably. The black colour on the wings has in some instances 

 given place to a deep grey. 



Hydrochloric Acid. 



V. tertka;. 



Total number. Hatched. Cripples. Died. 



169 83 21 86, or 51 per cent. 



Half the pupae failed to emerge, but no great excess were cripples. 



The main feature of interest is the change in the colour of the 

 wings, the normal Indian red colour being replaced, in some instances 

 more or less completely, by a dirty grey. This variation occurs more 

 frequently in the upper wings, but is seen also in the lower. I 

 should be interested to know whether varieties of this particular 

 colouring occur naturally, and if so in what neighbourhood, as facts 

 of this sort would possibly give us further knowledge of the cause of 

 variations. 



A. grossulariata. 



Total number. Hatched. Cripples. Died. 



139 80 10 59, or 42 per cent. 



This species shows no noteworthy feature. 



