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2 



93 



OBSERVATIONS concerning 



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the air paffages in the fame manner as oil, which applied 

 to the fides of infeds, kills them immediately. Both tliefe 

 experiments may be eafily tried, and if they fail, others 



1 



fuggeiled. 



Wheat being now in bloom, and the flies probably very- 

 bufy in impregnating the tender grains with their eggs, 

 all that can be done this feafon is, to prevent the hatching 

 of thofe eggs, by threfliing out the corn as foon as pofli-' 



ble, and drying it in kilns or the liot fun, and keeping ic 

 aftcrvv'ards in tight vcffels, or deep bulk in clofe granaries : 



If it fhoukl heat in the veflbls, it might be readily cooled, 



and kept fo, by ventilating it an hour once a week, wit! 



a pair of common houfe bellows, according to Dr. Ilaleh 



diredion* 



It fhould not be ftirred in bulk, if it can be avoided 

 that it may quickly encruft upon the top, and exclude the 



air. 



' If it is not convenient to threlh it out early, the (heaves 



fhould be defended from the acceffion of air, as before 

 propofed, till late in winter, and afterwards kept in bulk 

 or tight veffels, to attempt the prevention of fpring flies'; 

 for which purpofe the wheat fhould be threfhed outhefore 



fpring. 



If the fl:alks of wheat have not been preferved from the 



injury of the flics, the injured part fliould be threfhed fe 



parately, and the wheat ufed immediately, or deftroyed, 

 or the eggs in 



Wl 



flies 



appear in granaries, they fliould be killed immediately, to 

 prevent their doing further mifchief. 



But as all thefe things require additional labour and ex- 

 pence, it is much to be wiflhed the injury could be totally 

 prevented; and which, it is reafonablc to exped, may be 

 attained folely by a proper change ot feed grain annually; 

 that is, to fow the low moift lands with hard, dry, flinty 

 wheat, of high mountains lands, inftead of their own 

 produd. For it is well known to naturalifls, that the qua- 

 lity of fruit, grain and vegetables, depends on the climate 



and 



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