•; 



Now the grossulariata were in great measure destroyed in the 

 water-laden atmosphere, and failed entirely to emerge in the con- 

 tinuous high temperature. Hydrogen sulphide, although injurious, 

 was not so destructive to these pupse as to those of urticce, but it 

 had, apparently, the curious effect of crippling all of those that came 

 out. The effect of the reagents on the colour of the wings is also 

 interesting. 



Chlorine would appear to have a marked effect on the red colour 

 of the urticce. Whether this result is due to a want of development 

 of the red pigment, or if it is due to the red colour fading after it 

 had developed, I have yet to learn. The chlorine, however, seems 

 to have little effect on grossulariata. 



Sulphur, on the other hand, shows no action on urticans pigments, 

 but the grossulariata emerging from that jar were rather markedly 

 suffused with black. 



These experiments were all on pupae but I very much hope, later 

 on, to have the opportunity to try larva? also. 



I trust that these notes have interested you. and knowing, as I do, 

 that many of you are much more conversant with Lepidoptera than 

 I am, I trust that I may be able to gather some ideas this evening 

 that will guide me in any further work I may do in this direction. 



