February.'] HOT-HOUSE — OF INSECTS, ETC. 141 
sun is more powerful. An inch or two on a few of the sashes, 
as has been previously observed, will be effectual in keeping 
the temperature low enough. 
With regard to firing, what was said last month may 
suffice for this. Always recollect that it is nioro preferable to 
keep out the cold than to put it out. It will frequently 
happen in the time of intense frost that the weather is dull. 
In such cases, fire in a small degree is requisite all day. 
Heavy snows ought never to be allowed to remain on the 
shutters while they are on the house. If the snow lies on 
the sashes one day, the internal heat will dissolve some of it; 
night coming on, will freeze it to the wood-work, when it 
will become a solid mass, and frequently cannot be separated 
without much damage. If allowed to remain on for two days, 
the plants are very much weakened and the foliage discoloured. 
Therefore, let the snow be cleared off instantly, that no incon- 
venience may take place. 
It will be observed that plants absorb more water this 
month than last. The quantity given will require to be in- 
creased, according to the increase of vegetation and the ad- 
vancement of the season ; but never give it uutil the soil 
begins to dry, and then in such proportion as will reach the 
bottom of the pot. The best time to water is after the sun 
has got on the house in the morning, observing all the di- 
rections given in January. 
OP INSECTS, ETC. 
Perhaps sufficient observations were given under this head 
last month ; but the importance of keeping the disagreea- 
ble visiters out of the house constrains us to make a few 
more remarks. Man cannot be too frequently guarded 
against his foes, more especially when they are summoning 
all their forces, and no profession has more than that of the 
Horticulturist. Let a strict examination be made about the 
end of the month for the red spider ; they will be in operation 
some weeks before their depredations are observed on the 
foliage. The under side of the leaf is their resort in the first 
instance, and on such plants as have been already mentioned. 
Observe daily the young shoots, in case the green fly be- 
