276 



APPENDIX I. 



enough to contain an ordinary quinine bottle. The 

 zinc pan is filled with clean sifted earth or sand (e), 

 and the quinine bottle is for the reception of the food 

 plant. The cage admits of abundant light and air, 

 and also of the easy removal of excrement and frass 



FIG. 193. Breeding cage, described in the text. 



which falls to the ground ; while the insects in trans- 

 forming attach themselves to the sides or the cap ac- 

 cording to their habits. The most convenient dimen- 

 sions I find to be twelve inches square and eighteen 

 inches high ; the cap and the door fit closely by means 

 of rabbets, and the former has a depth of about four 



