GENERAL REMARKS. 261 



The collector should be furnished with knives, 

 scissors, scalpels, pliers, nets, a large assortment 

 of pins of various sizes, needles, a hammer, small 

 hatchet, packing-cases (large and small, including 

 cork boxes for lepidoptera and other insects, and 

 a great number of pill-boxes in nests), cotton and 

 paper, and also with a folding-net, hoop-net, 

 water-net, forceps, digger, glass phials, etc., for 

 collecting insects; he must also have a good 

 supply of prussic acid and arsenical soap. The 

 composition and mode of making the latter is as 

 follows : 



Camphor . . . 5 oz. 



Arsenic, in powder 2 Ibs. 



White soap .... 2 Ibs. 



Salts of tartar, or subcarbonate 



of potash .... 12 oz. 



Lime, in powder . . . 4 oz. 



Melt the soap completely with heat in a small 



quantity of water, and add the potash and lime ; 



then remove it from the fire and stir in the 



arsenic; next add the camphor, previously 



