34 



2 



DISEASES 



Sect. XIV. q. 2. 



refufe 



} 



fhoots of yew 



ey 



b 



will eat 



m when they are cut off, and begin to wither ; and on th 



count lofe a 



ficient poifot 



part of their acrimony; though there is Rill often fuf 



th 



deftroy th 



ma 



And it is even 



probable, that when the leaves of yew are withered to a c^reater d 



g 



their poifon 



mony becomes fo far deflroyed, that they 



fe to be deleterious to horfes ; fo th 

 ftomary in the winter to crop the young flioots of yew-trees and 



Hefle in Germany 



IS 



mixing them with other provender to give them as common food 

 horfes. See Anderfon on Agriculture, Vol. III. p. 590. 



On this account if wall-trees are frequently watered by an eno-ii 

 fo as to moiften their leaves or branches as well as the o-round at th 



the dry days in fpring, by which 



ey w 



be kept 



^^^ 



growth, I was told, that they would totally or nearly efcap 



the depredations of infedl 



but I found by an experiment well 



eluded on three trees, that this management had no efFea ; and I alfo 

 obferved in the fpring and fummer of this year, 1798, which feems 



h 



much favoured the produdion of 



that they 



r* 



tacked the moft healthy leaves of peach and nedarine trees, as well 



the others 



and that plums, ch 



black 



and many 



other trees fuffered by their depredations, though previoufly in perfed 

 vigour. And laftly, that on repeatedly having wa-fhed off many thou- 



fands of aphifes from, peach and nedai 

 from a forcible water 



by a firono- flream 



engine, that they evidently crawled again u 

 the ftems of the trees, or on the wall to which they were nailed, f 

 in another daythelowermoft branches were thus more infefled wit 

 them than the upper ones. 



The hiftory of the aphis, puceron, or vine-fretter, is fo curious 

 the deftrudion it commits on the foliage of the peach and nedarin 

 is in dry fummers fo irrefiftible, and its exiftence on other trees 



P 



extenfive, that it demands our partic 



Sed 



^r trees fo 

 See No. i . 7. of 

 From the obfervations of Swammerden, Bonnet, Dr. 



Richardfon, 



