f 938 ] 
6. Have you ever experienced any mode of correét- 
ing thofe noxious qualities in the foil? 
>. Have you ever tried whether any plants will 
grow in a foil thus impregnated, in particular, iii 
which it is faid will grow in it? 
8. Have you ever obferved trees, when their roots 
reach a ftrata full of aluminous or metallic particles, — 
decay or be arrefted in their progre/s; and what mea- 
Sures ought to be taken when that happens 2 
VIII. CONCERNING VERMIN, 
NOXIOUS TO VEGETATION, 
1. What are the kinds of vermin in the foil, whieh 
you have found hoftile to vegetation? 
Worms at the root, the foft fnail to the young 
plant, caterpillars to grown vegetables; and the 
houfe-fnail, the wafp, and the common fly to fruits, 
to which add the millepedes, the earwig, and the 
centipedes. ; 
2. Do you'know of any mode of deftroying them? 
Avoiding recent manure, frefh lime, bottles for 
wafps and flies, a quick eye, and an ative hand,,are 
the beft remedies I know. Semen preg onal 
will'do wonders. 
3. What are the kinds of infos in the air, wehich 
you' have found hoftile to vegetation? 
Infeéts intended here, are limited ufually to parti- 
cular fpecies, or fimilar fpecies of plants. Inthe 
fly-ftate they propagate fufficiently, without fuppo- 
fing them to float in the air. The 
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