294 APPENDIX I. 



prove more and more useful in each succeeding year. 

 Commencing with the eggs laid by imprisoned females 

 or found in the open field, he should note every change 

 which transpires, describe and, if possible, draw in de- 

 tail every stage, giving to each separate lot a distinctive 

 number, which it should keep until its name is known. 

 As his stock enlarges and his knowledge increases, 

 comparative study will supersede many of his earlier 

 descriptions ; but these will not have been without their 

 value ; they will have cost no more than they are 

 wortli ; his knowledge will have been gained through, 

 as well as at the expense of, his earlier work, none of 

 which will he rightly regret ; he can therefore be neither 

 too minute nor too exact, nor can he afford to relax 

 any endeavor until he has proved it unnecessary. 



He should preserve in his permanent collection speci- 

 mens to illustrate every condition of the creature's life, 

 as well as all objects which illustrate its habits and 

 vicissitudes. Especially should all variations be pre- 

 served. The egg with the leaf upon which it is laid in a 

 state of nature ; not only the caterpillar at every stage, 

 but in all the attitudes it assumes, the nests it weaves, 

 the half devoured leaves to show its manner of feeding, 

 the ejectamenta, the parasites by which it is beset ; not 

 only the chrysalis, but the emptied skin ; the butterflies 

 of each brood together with some preserved in their 

 natural attitudes when at rest, and when asleep ; and 

 such dissections of the external parts as can be sepa- 

 rately mounted and cannot otherwise be readily seen ; 

 also the wings and body of the butterfly denuded of 

 their scales, to study the structural framework of the 

 insect ; and, when possible, dissections of the internal 

 parts preserved in alcohol. 



Every pinned specimen, excepting such as illustrate 

 the anatomy only, should bear upon the pin a label giv- 

 ing the place and date of capture, and, when necessary, 

 a number referring to a catalogue or note book in which 

 memoranda may be entered to any extent that is de- 

 sired. The name of the species may be given on a 



