210 REMARKS ON THE PRESERVATION, &c. 
substitute for cork, the preservation of the collec- 
tion during its transportation. After having care- 
fully packed the subjects, every necessary precau- 
tion that suggested itself was used in securing the 
boxes against accidents during the voyage. ‘They 
were individually painted and covered with oil 
cloth. Each box was then placed in an outer case, 
made of the same substantial materials, and secured. 
in the same manner,” by which means the whole 
of his extensive and valuable collection of lepidop- 
terous insects were safely brought to England. 
Caterpillars may also be preserved by first 
squeezing out theirentrails, and insert into the punc- 
ture a glass tube which has been drawn to a very 
fine point. This pipe must be blown into while 
the skin of the caterpillar is held over a charcoal 
fire, and kept constantly turned round, until it be- 
comes hardened. It is then rubbed over with oil 
of spike, dried, and then placed into the cabinet. 
They should be gummed to a piece of card, so that 
they may not be touched in lifting them, as they 
are very liable to be squeezed, and thus broken. 
