82 
ON KILLING AND 
nesia alone has been used with success. The 
oil of petroleum applied with a camel’s hair 
pencil, and the insect placed in a warm situa- 
tion to dry, has also been usefully employed. 
To preserve the eggs of butterjiies or moths , 
Swammerdam pierced them with a fine needle, 
and pressed the juice through the aperture; 
he then inflated them, until they regained 
their proper form, by means of a small glass 
tube, and then filled them with oil of spike in 
which some resin was dissolved. But if only 
punctured with a very fine needle they will 
dry without shrivelling. Hot w’ater destroys 
the colour, and makes them contract. 
To Preserve Caterpillars. The animal 
must first be killed by immersion in spirits of 
wine, or hot water, and then put for a short 
time into some distilled vinegar mixed with 
spirits of wine to harden the parts ; the con- 
tents of the body must then be extracted, or 
squeezed out by the gradual pressure of the 
thumb and finger, beginning at the head, and 
pressing on to the anus, at which part a small 
aperture should be previously made. When 
the inside is cleansed as much as possible by 
small rolls of blotting paper, introduce a stem 
of hay or slender straw into the anus, round 
which, and near to the extremity, pass loosely 
