300 



APPENDIX B. COLLECTING, PINNInG, SETTlNGt. 



are in the collection relating to that one species. By bringing these all together in 

 one place one has at a glance the whole history of each species so far as it is known. 



A separate index of food plants and a systematic index then become necessary so 

 that one may at a glance find all the pests of a particular crop, or all the insects of a 

 particular family that one has in the collection. 



I prefer to keep nearly all this information on cards, in a card catalogue series, and 

 only rearing notes and field notes are entered separately and then condensed on to the 

 regular card series. The methodical collection of all information is a great part of any 

 continuous entomological work, and for lack of it a great deal of work has been lost. 

 I have not space to describe the card system in use ; I am convinced that methodical 

 and careful note taking is of the greatest importance if one aims at anything higher 

 than a mere collection of dried specimens. The most trivial things may later on be 

 found to be of the utmost importance, and one racks the memory in vain to remember 

 the precise details. 



Formulse. 



l.—B. C. bottle. 



Benzene . 

 Chloroform 



Absolute alcohol 

 Glacial acetic acid 



■) Equal parts. Add a few drops 

 > of oil of bergamot or other 

 ) essential oil. 



Killivg fluid for Aptera 



Equal pai'ts. 



Formalin, 

 Formic aldehyde 40% (Formol) 1 part. 



Water 



White gum arable 

 White gum tragacautli 



1 9 parts. 

 Cement. 



In equal parts, powdered, with 

 enough water to make a paste, 

 and a few drops of carbolic acid. 



Aluminium sulphate 

 Water . 

 Gum arable 

 Water 

 W ix the two. 



Alcohol, 95% 

 Glycerine . 

 Water 



Gum for labelling glass bottles. 



2 grams •) dissolve. 

 20 grams ) 

 . 74 grams ■Jjjj^^^^^,^^ 

 180 grams ) 



Preserving fluid. 



" ^ ^ Add \ per cent, of acetic acid to 

 1 part > fiiiiahed mixture. 

 1 part ^ 



Cyanide of potassium 

 piaster of Paris . 



2. — Killing bottle. 



. 1 oz. 

 . . . . . . 4 oz. 



Place the cyanide in the bottle, cover with half the plaster. Mix the rest of the 

 plaster to a cream with water, and quickly pour over the dry plaster and cyanide in tha 

 bottle. 



