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heaps on the windward fide, and the fcattered ones, 

 be lighted and kept fmothering during the conti- 

 nuance of the wind in that quarter; the lefs the fire 

 and the more the fmoke, the better. Should the 

 wind happen to fhift, thofe heaps on the quarter it 

 fliifts to muft then be lighted, and kept fmothering 

 in like manner; fo that during the growth of the 

 tender turnip leaf, and until it becomes rough and 

 out of danger, this fumigation and fmoke over and 

 acrofs the field muft be continued from one quarter 

 to the other; which^ I venture to afifert, will effec- 

 tually deter and prevent any winged infect tribe 

 from approaching the turnip ground; nay more, if 

 there already, it would mod compleatly drive them 

 from thence, as fuch delicately formed infects (which 

 can only feed upon the mod tender leaf) would be 

 ill able to continue long in fuch a fmother of fire 

 and fmoke. The confequence is obvious and cer- 

 tain, that if the fly be kept from approaching the 

 field, the turnip crop isjafe — and few, I believe, will 

 difagree with me, that prevention is better than remedy. 



I am induced to be the more fanguine of the 

 fuccefs of this method, from the great fuccefs, 

 which on many trials attended a fimilar idea of 

 mine, for the prefer vation of cabbage plants from 

 caterpillars by means of elder bufhes, which was 



infertcd 



