138 HOT-HOUSE — INSECTS, ETC. [January. 
houses about Philadelphia within these few years, and, if not 
instantly destroyed, increases rapidly. It is of a white dusty 
colour ; when broken, of a brownish red, generally covered 
with down, under which it deposits its eggs ; and they, in a 
few months, come forth in great numbers. The cocus gene- 
rally is of a dormant nature, but in warm weather they may 
be seen moving rapidly up the stems of the plants. Fumi- 
gating has no observable effect on these insects ; therefore, 
as soon as they appear, recourse must be had to other means. 
The liquid made from the following receipt is death to any 
of the Cocus tribe : Take two pounds of strong soap, one 
pound of flour of sulphur, one pound of leaf tobacco, one 
and a half ounce of nux vomica, with a tablespoonful of 
turpentine, which boil in four gallons of river water to three; 
then set aside to cool. "When boiling, stir it well with a 
stick, continuing to do so until it is reduced as above. In 
this liquor immerse the whole plant, drawing it to and fro 
gently, that the liquor may penetrate everywhere. This 
done, lay the plant on its side, until it begins to dry, then 
syringe well with clean water, aud put it in its respective sta- 
tion. Where a collection of plants is free from any insects 
of the kind, every plant that is introduced ought to be mi- 
nutely scrutinized, that the unclean may be kept from the 
clean : the above insects will feed almost on any plant, but 
indulges on Grdsulas, any of the bristly Cactus, Gardenias, 
and in fact whatever is in the way. 
Corns , or brown scaly insect, is frequently 
found on many plants, but we never could perceive that it 
does any other material injury than soiling them. We have 
always observed, that it is found in winter to abound in 
those situations which are most excluded from air; therefore 
is of less importance than the other species, which eat and 
corrode the leaves of tender plants. A washing with strong 
soapsuds will destroy them, or the above liquid will do it 
more effectually. Tie a piece of sponge on the end of a small 
stick, and scrub every leaf, stem and crevice. Fumigating 
destroys the larva? of this species. 
Cocus , or small white scaly insect, which 
generally infests Cyras, A'crium, Oleas, and Acacias, <v.c, 
may be destroyed by washing as above with a sponge, and 
a strong decoction of tobacco, using the liquid about the 
warmth of 100°. Being thus heated, it irritates the insect, 
