46 
destruction needs no further comment than what is 
advanced upon Sang’s recipes. 
The ingredients which Sang’s mixture is 
composed of, are all invested with properties pro- 
ductive of pernicious effects upon Caterpillars in 
general, except the sulphur, which is of no more 
service than the black pepper, as recommended by 
Hamson. But although the mixture is composed 
of ingi'edients sufficiently efficacious for their de- 
struction when unprotected, so well secured are 
the Caterpillars at the above period, by a well 
manufactured filmn, that I doubt whether it will 
prove at all useful for their destruction. It would 
but require little trouble to prove it, by applying 
it on one side of the tree, and leaving the other 
undone. I have been anxious to find means for 
their destruction in winter months, and have tried 
boiling water, oil, different kinds of spirits, soap, 
potash, and many other things, but never found 
them productive of any good at this period. 
The Caterpillars, at the above period, when 
Sinclair performs the operation, are too well 
protected for it to have any effect upon them ; and 
even if they were unconcealed none would be 
destroyed. To prove this, a few may be dusted 
thick over with lime, any time when feeding in 
the spring months, and it will be found they will 
even then escape destruction. 
It is doubtful whether the burning of straw, 
&c. is of any use towards their eradication. Regi- 
men, as held forth by Loudon, certainly produces 
