22/1 THE ATMOSPHERE OF PLANT-HOUSES. 



in each; they are a pretty light yellow colour. It is a handsome 

 species. 



A. piuemorsa. — The leaves are short, and the plant forms a pretty 

 bush, blooming very profusely ; flowers a rich yellow. Very pretty. 



A. dentifera. — The leaves are four inches long, very narrow ; it 

 forms a neat branching bush. The flowers are a rich deep yellow 

 colour, and the globular heads large. It is a very beautiful species. 



A. ovata. — The leaves are oval-shaped, half an inch across ; it is a 

 very neat bushy plant. The flowers are produced in long spikes, and 

 are a rich yellow colour. It is a very lovely species. 



A. leptoreura. — Leaves like a thinly-foliaged Pinus, about three 

 inches long. The flowers are a deep yellow. It is singularly pretty. 



A. pubescens. — Neat small foliage ; and the rich yellow globe 

 flowers, borne in drooping panicles, are very handsome. 



A. decurrens. — Deep yellow, in large branching panicles. Very 

 showy. 



A. sqdamata. — The foliage is small, and the branches are drooping, 

 bearing a vast profusion of deep golden-coloured flowers. It is a very 

 interesting and handsome species. 



A. Eiceana. — Small Pinus-like leaves. The flowers are borne in 

 cone-shaped heads, profusely, of a pale yellow colour. A very neat 

 species. 



A. undul^efolia.— Flowers a rich yellow ; singular foliage. Pretty. 



A. lancifolia. — Pretty lance-shaped leaves, and bright yellow 

 globe flowers. 



THE ATMOSPHERE OF PLANT-HOUSES, viz., STOVES, &c. 



BY [FLOBISTA. 



This subject not having been noticed in your Magazine, and being one 

 in which all cultivators of in-door plants are specially connected with, 

 I am induced to transmit the following particulars upon the same for 

 insertion in an early number : — 



Some idea may be formed of the prodigiously increased drain upon 

 the functions of a plant, arising from an increase of dryness in the air, 

 from the following consideration. If we suppose the amount of its 

 perspiration, in a given time, 1o be 57 grains, the temperature of the 

 air being 75 J , and the dew-point 70, or the saturation of the air being 

 849, the amount would be increased to 120 grains in the same time, if 

 the dew-point were to remain stationary, and the temperature were to 

 rise to 80 : ; or, in other words, if the saturation of the air were to fall 

 to 726. 



Besides this power of transpiration, the leaves of vegetables exercise 

 also an absorbent function, which must be no less disarranged by any 

 deficiency of moisture. Some plants derive the greatest portion of 

 their nutriment from the vaporous atmosphere, and all are more or less 

 dependent upon the same source. The Nepenthes distillatoria (Pitcher 

 plant) lays up a store of water in the cup formed at the end of its 

 leaves, which is probably secreted from the air, and applied to the 



