i 62 different species of insects 
greatly encourages its increafe, it generally abounds in moft 
Hot-houfes. 
The Acari frequently attack the leaves of the Vine early in 
thefummer, and as their increafe in dry weather is amazingly 
quick and great, they will, without fome method of controul, 
foon greatly endamage, and, in time, totally deftroy the foliage. 
They generally refide and breed on the under-fide of the 
leaves, and the infefled leaves are very diftinguhliable as foon 
as they are attacked by them, for the infedt wounds the fine 
capillary veffels with its probofcis, and this caufes the upper 
furface of the leaf to appear full of very fmall dots, or fpots of 
a light colour. When the Acari are very numerous, they 
work a fine web over the whole under- fide of the leaf, as alfo 
round the edges thereof j and it is curious enough to obferve, 
that they commonly carry this web in a ftreight line, from one 
angular point of the leaf to another, on which boundary line, 
in a warm day, they pafs and repafs in very great numbers. 
The Acari, however, da not confine themfelves to the leaves 
only, but attack the bunches of grapes alfo, efpecially at the 
time when they are almofl: ripe; and as they extradt the juices 
from them, the grapes foon become foft, flabby, and ill-fla- 
voured. 
2. The Thrips. This fpecies abounds in moft Hot-houfes, 
and is hurtful to moft plants kept in them. It is often injurious 
to 
