r 



360 



DISEASES 



1 



Sect. XIV. 3. 4 



The white butterflies, which depofit their eggs on cabba'^-e pi 

 e {cen flying about awkwardly in fummer, and fhould be cai 

 d deftroyed by the gardener. 



o 



Or they perhaps might be invited 



as a 



and poifoned by a mixture of honey, and water, and arfenic ; 

 wealthy man in Italy was faid to have poifoned his neighbour's bees. 

 See Se6t. VI. 6. 3. Thefe cabbage-caterpillars would increafe in de- 

 ftrudlive numbers, but are half of them annually deflroyed by a fmall 

 ichneumon fly ; which depofits its own eggs in their backs, which 

 there hatched by the warmth of the animal, and live on the filk 



d eroding their way out fpin 

 fmall cacoons of their own ; ten or twelve of which hang on each 



pillar; which thus perishes inftead of changing into a butterfly. 



th 



fecreted for its fut 



ft 



This I faw happen to a great many of them, which were put 



box 



bran with a few cabb 



v^ 



d covered with gauze 



a 



Th 



f .- 



few days before they were ready to change into chryfolift 

 ichneuman fly (hould therefore be encouraged, if his winter habita 

 tion could be difcovered. 



4. The variety of infecls, which infeft hot-houfes. as the arnriK 



thrips 



a 



d 



and the means commonly ufed to deftroy 



them by the fmoke of tobacco, or by the powder of fulphur and 

 bacco, or by folutions of lime and fulphur, aredefcribed in Speechly 



books on the Vine and Pine 



pi 



but require fom 



ap 



A friend of mine, by fubjeding a wall-tree to the fmok 



of fulphur by hanging a matt before it during the fumigation, killed 

 both the infeds and the tree. 



5. Other kinds of infeds are produced beneath the foil. 



or occa- 



flonally retire 



families of fn 

 fheaths over 



terreft 



wi 



ial hab 

 d with( 



Of thefe are th 



fliell 



d other infeds with 



their wings,. with 



which they are furniflied to prevent 

 any injury from the fridion of the fides of the holes they make or 

 defcend into. 



It has been lately fuppofed, that the great deftrudion of the crops 



of 



\ 



