200 APPENDIX. 



of the species may be given on a 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 redetermi- 

 nation if misplaced 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 in- 

 dicate 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 indistin- 

 guishable at sight, and a lack of exactitude here will viti- 

 ate one^s observations. 



Any one pursuing vigorously such a course of study and 

 collection of native butterflies w411 be enchanted to see 

 how fascinating the study is, how rapidly his collection 

 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 enthu- 

 siasm. 



t: 



