300 APPENDIX B. COLLECTING, PINNING, SETTING. 



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. 



Formate. 



1. S. C. bottle. 



Benzene 7 - E 1 ual P arts - Ac l ( l a *" ew drops 



> of oil of bergamot or other 

 Chloroform } essential oil. 



JLil ling flu id for Ap tera. 



Absolute alcohol .... ] Equal parts . 



Glacial acetic acid . . . ) 



Formalin, 



Formic aldehyde 40% (Formol) 1 part. 

 Water .... 39 parts. 



Cement. 



White gum arabic } In equal parts, powdered, with 



> enough water to make a paste, 

 White gum tragacanth . } and a few drops of carbolic acid. 



Gum for labelling glass bottles. 

 Aluminium sulphate . . 2 grams ") 

 Water .... 20 grams ) 

 Gum arabic . . 74 grams ") Disgolve 



Water .... 180 grams ) 

 Mix the two. 



Preserving fluid. 



Alcohol, 95% . 2 parts -v . 



,., / Add \ per cent, of acetic acid to 



ferine ' 1 P arfc { finished mixture. 



Water . . .1 pa rtJ 



2. Killing lottle. 

 Cyanide of potassium . . . . . . . . 1 oz. 



Plaster of Paris . . . 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. 



