84 : Description oF Gez on Manna, 
in their natural state, covered with. a white filamentous or cotton like 
substance. —Fie 5, is the same parcel of the larvae, removed from the leaf 
and reversed, which exhibits an undefinable mass, by the confused mix=- 
iure of legs, somewhat darker, by having dried on the leaf—Fig. 6, 
shows a fragment of the Manna, in the state it was taken from the tree.— 
It is found however in pieces of various shapes; some fiat, as taken off the 
leaves. of the trees sometimes in cylindrical pieces, impressed with. the 
figure of the stalk or branch on which it has. fallen. 
Ter formation of this. substance upon those parts of the tree from: 
which the insect does not receive nourishment, may appear difficult to ace- 
count for, but if the economy of these infestors of plants, the cocci and 
ihe aphides be attended to,,the difficulty. will vanish. 
_ Tue Revd, Dr. Kirsy,.in-his introduction to Entomology, vol. 2d 
page 89, has given a most interesting description of the natural economy 
of these tribes of insects, or rather.of the aphides;:and I have witnessed 
all he relates on ‘ the loves of the ants and the aphides.’—It is not 
therefore in my. mind a matter of difficulty, or unreasonable to suppose, 
that had the numerous aphides, I have seen drawing their nourishment 
from the succulent parts of a plant, ‘been: unattended by the multitude of 
large black ants, incessantly urging them to. part with the luscious drop, 
I should have seen the accumulation of this limpid liquid froma thousand 
springs trickling down the leaves and stem, drying as their surfaces spread, 
and drop after drop forming incrustations, bearing impressions of the 
branch. or leaf, and like the substance I. now produce before the Society. 
