104 



ticular in the case of aphis lanata. Tlic 

 cleaning trees by scraping and cutting 



for forcing grapes and other fruits, are stored 

 with a great number of species that are introduced 

 by exotic plants; and it has been, for time immemo- 

 rial, considered by our best gardeners, as a requisite 

 practice in winter time, to expose such places or 

 the trees at least, to the influence of the weather. 

 We know our chafer gets into the ground for pro- 

 tection, our earth worm goes also into the ground, 

 below the action of the frost, and the eggs of moths 

 and butterflies are secured by a strong gluten, as 

 is described above. The snail has its protection 

 in its shell, and its eggs are laid under the pro- 

 tection of stones, &c. But no doubt it would be 

 difficult to keep alive the eggs of silk worms if ex- 

 posed to frost, or the cock-roach, which is always 

 abundant in ships when they arrive from hot cli- 

 mates, or the coccus, so destructive to grapes in 

 the hothouse : of the last, it is worthy notice, 

 that it is never seen without doors. 



I have noticed an opinion given by a very intelli- 

 gent gentleman on this subject, in the Transactions 

 of the London Horticultural Society, that the idea of 

 the eggs of insects being killed by the action of the 

 frost is in general erroneous ; but this observation 

 was made to caution gardeners from laying too much 

 stress on the effects of the weather for performing what 

 they by their industry ought to accomplish. I am truly 

 sorry the practice of gardening is at so very low an 

 ebb, as to furnish reasons for such hints. But I am 



