103 



viously to being applied. In the neigh- 

 bourhood of London and other places, 

 many useful manures may be obtained, 

 such as the refuse of sugar-bakers, soap- 

 makers, &c. &c. bullocks' blood, hair, and 

 the scraping of seal skins, bone dust, and 

 the refuse of manufacturers of cart grease, 

 the coarse graves from tallow-chandlers 

 not fit to feed animals. The neighbour- 

 hood of Saffron-hill affords a large variety 

 of these precious things. 



As to preventing the ravages of in- 

 sects, I can give but little hopes to our 

 fruit growers, except by the destruction 

 of their eggs, or when they are in their 

 young state, and in some instances, by 

 exposing of the parts where insects breed 

 to the action of frost *, and this in par- 



* I am aware of its being the received opinion, 

 that the eggs of insects are in general impervious to 

 the frost ; this, I am fully aware, holds good in a 

 great number, but we have many species of these 

 creatures that are not originally natives of this 

 country, and consequently, if they are from a 

 ch'mate not accustomed to frost, they are likely to 

 be killed or checked thereby. Hothouses used 

 F 4 



