138 HOT-HOUSE — INSECTS, ETC. [Jmiuary. 



bouses about Pbiladelpbia witbin tbcse few years, and, if not 

 instantly destroyed, increases rapidly. It is of a wbite dusty 

 color; wben broken, of a brovvnisb red, generally covered 

 witb down, under wbicb it deposits its eggs ] and tbey, in a 

 few montbs, come fortb in great numbers. Tbe cocus gene- 

 rally is of a dormant nature, but in warm weather tbey may- 

 be seen moving rapidly up the stems of tbe 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, and 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 insect will feed almost on any plant, but 

 indulges on Crdsulas, any of the bristly Cdctus, Gardenias^ 

 and in fact whatever is in the way. 



Cocus , 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. Fumi- 

 gating destroys the larvae of this species. 



Cocks , or small white scaly insect, which 



generally infests Ct/cas, Nerlumj Okas, and Acacias, &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, 



