REARING INSECTS IN GENERAL. 



245 



a depth of about four inches to admit of the largest cocoon 

 being spun in it without touching the box on which it rests. 



FIG. 271. Breeding-cage. 



The zinc pan might be made six or eight inches deep, and 

 the lower half filled with sand, so as to keep the whole 

 moist for a greater length of time. 



"A dozen such cages will furnish room for the annual 

 breeding of a great number of species, as several having 

 different habits and appearance, and which there is no 

 danger of confounding, may be simultaneously fed in the 

 same cage. I number each of the three parts of each cage, 

 to prevent misplacement and to facilitate reference; and 

 aside from the notes made in the note-book, it will aid the 



