88 PHOTOGRAPHY FOR NATURALISTS. 



captives will have to be conveyed home in good order, 

 and for this purpose nothing serves better than a 

 pocketful of small corked glass tubes. The kind in 

 which M.Q. developers are stored is a good size, and 

 easily obtainable. Those supplied by the entomological 

 trade are as a rule rather too small not too small to 

 contain the insects, but too small to coax them into 

 from the net. 



Butterflies and creatures of a delicate structure 

 should be killed in a killing bottle. Most photo- 

 graphers possess the materials for their manufacture- 

 potassium cyanide, with an overlay of plaster of Paris. 

 Anything that is not likely to be damaged thereby can 

 be dropped into boiling water, and this is the most 

 efficacious and instantaneous way of killing the larger 

 beetles. In either case the subsequent use of a setting 

 board will probably be necessary if we are to have the 

 insect's legs, which are usually important, displayed so 

 as to be distinguishable. When the insect is too small 

 to be easily set on a board, it may be placed on a piece 

 of card, or even plant stem, which has been smeared 

 with a thin coating of coaguline. The legs are gently 

 pulled into position with a hooked needle point while 

 the coaguline is still soft, and left to stick. 



For the preservation of all kinds of organic matter 

 and, to a certain extent, of natural colours, a weak 

 solution of formalin, say five per cent., will be found a 

 decided improvement on the old-fashioned turpentine 

 or methylated spirit. 



Precautions to secure correct colour values are, in 



