Chloride of Lime. 



V. urticoz. 

 Total number. Hatched. Cripples. Died. 



7 4 o 3, or 43 per cent. 



I much regret that I have only tried the effect of this reagent on 

 seven pupse. Of the four that emerged one shows the same 

 pigmentary changes that occurred in the hydrochloric acid jar. 



A. grossulariata. 

 Total number. Hatched. Cripples. Died. 



ioi 75 4 26, or 25 percent. 



Nothing worthy of comment occurred among the specimens that 

 emerged. 



Sulphur. 



V. tirticoz. 

 Total number. Hatched. Cripples. Died. 



134 52 28 82, or 61 per cent. 



The death-rate was high among these pupae and over half of 

 those that emerged were cripples. No alteration was observed in 

 the colours on the wings. 



A. grossulariata. 

 Total number. Hatched. Cripples. Died. 



7 2 27 10 45, or 63 per cent. 



Sulphur also caused rather a high mortality in this species. 



The chief feature, however, is the large number thai showed an 

 increase of black pigment on the wings; this occurs rather as a 

 suffusion than as an increase in size of the normal black markings. 



Hydrogen Sulphide. 

 V. urticce. 



Total number. Hatched. Cripples. Died. 



a 7 6 28 5 148, or 84 per cent. 



The effect of this gas was disastrous to the pupa?. However, 

 those that emerged showed but few cripples, and the colour of the 

 wings was normal. 



A. grossulariata. 

 Total number. Hatched. Cripples. Died. 



IQI 28 28 73, or 72 per cent. 



Here several pupa? were destroyed ; but the remarkable feature in 



