APPENDIX I. 295 



separate label at the head of each collection of objects 

 which illustrate its history ; and the name may of 

 course also be added at will to any specimens which 

 once determined may require redetermination if mis- 

 placed and not specially marked. 



In rearing it is essential that every breeding cage or 

 pot should be marked with a number or by other means 

 to indicate its contents. Nothing should be left to 

 memory in this particular. Nor should caterpillars 

 which are only presumably of the same species be placed 

 in the same cage, as there are many allied kinds which 

 are almost indistinguishable at sight, and a lack of ex- 

 actitude here will vitiate one's observations. 



Any one pursuing vigorously such a course of study 

 and collection of native butterflies will be enchanted to 

 see how fascinating the study is, how rapidly his collec- 

 tion grows, what an endless" source of interest attaches 

 to these humble but exquisite creatures, and into how 

 many lines of real investigation his steps are tending. 

 No one can undertake it without being himself the 

 gainer by it, and without infusing others with his own 

 ever fresh enthusiasm. 



