204 CATERPILLARS AND THEIR MOTHS 



mologists. Butternut and English walnut succeeded 

 best with ours. 



They are very satisfactory caterpillars to rear, be- 

 cause they are, as far as our experience with three or 

 four broods goes, very free from disease, do not entangle 

 each other in " spin," and seldom crawl over or other- 

 wise interfere with each other. They eat and drink as 

 if they fully realized eating and drinking to be their 

 business in life, and One of Us was kept busy providing 

 fresh and succulent leaves one very dry summer. The 

 only way of getting good ones was to pick the best 

 she could find and put the freshly cut stems in water 

 long enough to supply moisture to the leaf-pulp. This 

 plan often works well in very hot, dry seasons, when 

 without it the caterj^illars would not thrive on the dry 

 leaves. 



