Insect Colouring 



Ingredients of our glass-painters are laid on 

 our stained-glass windows. 



At other places the skin is coloured in its 

 very substance; the colouring-matter forms 

 an integral part of it and can no longer be 

 swept away with a camel-hair brush. Here 

 we have a dyed fabric, represented in our 

 windows by the panes of coloured glass which 

 the crucible decorates uniformly with this or 

 that tint, by means of the incorporated metal- 

 lic oxides. 



Whereas, in these two cases, there is a 

 profound difference in the distribution of the 

 chromatic materials, is this true of their chem- 

 ical nature as well? The suggestion is 

 hardly admissible. The worker in stained 

 glass dyes or paints with the same oxides. 

 Life, that incomparable artist, must even 

 more readily obtain an infinite variety of re- 

 sults by uniformity of method. 



It shows us, on the back of the Spurge 

 Caterpillar,^ black spots jumbled up with 

 other spots, white, yellow or red. Paints 

 and dyes He side by side. Is there on this 

 side of the dividing line a paint-stuff and on 

 the other side a dye-stuff, absolutely different 

 in character from the first? While chem- 



^The caterpillar of the Spurge Hawk-moth. — Trans- 

 lator's Note. 



287 



