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8. Do not young trees thrive better, when their 
roots are near the furface, and not too deeply buried in 
the earth? Would they thrive in heaps of ftones, which, 
it is faid, has been fucce/sfully tried in France ? 
I believe the affirmative is generally admitted.— 
Stones are often placed underneath a young tree, for 
the purpofe of preventing a tap-root, and obliging 
it to extend its roots horizontally. Vines flourifh 
amoneft {tones and rubbifh, but I recolleé& no other 
tree that does. 
9. Whenyou raife plants under glaffes, how often are 
you obliged to admit frefb air ? 
10. If no frefh air were admitted, would the plants 
grow languid, or perifb ? 
Yes, certainly. They will indeed grow, but 
feeble, flender, dilute in colour, and fainter in odour. 
11. Do plants thrive as well kept in glaffes as in 
the open air, the temperament being equal? 
If the foil and clime are fuitable, the open air is 
preferable; but glaffes are ufed to bring plants for- 
warder than in the natural ground they would be. 
12. Does there feem to be any fympathy or antipathy 
between plants; or any natural difpofition in fome 
plants to thrive when growing near to certain others ; 
and the reverfe?* 
I have never obferved either vegetable fympathy 
or antipathy. Nature left to herfelf will fill up every 
* It is faid, that hops and potatoes do not agree together. 
VOL, Ix. Q interval, 
