GENERAL MANAGEMENT OF GREEN-HOUSES. J35 
gases which attend flues heated in the ordinary manner are entirely destroyed. The 
gaseous steam produced by your furnace it by no means injurious to the most 
delicate plant, probably the reverse. Several plants submitted to its effects were 
not in the least injured, neither does it appear, by a careful chemical analysis, that 
it contains anything injurious to vegetation.” 
From these testimonials and our own experience, we certainly would recommend 
the use of it for a hot-water apparatus, in preference to one built on the old 
principle. For, although the cost is greater at the outset, yet the constant command 
of heat, and the refuse capable of being burnt in it as fuel, speak highly in its 
favour. When it is determined to heat by hot water pipes, the following cheap 
mode may be useful as a guide, the expense we detailed in the et Horticultural 
Register,” vol. i., p. 300. The materials may be obtained at any ironmonger’s. 
Our correspondent, who furnished us with it, obtained his materials from Messrs. 
Graham and Sons, Iron Wharf, Trig Lane, Thames Street, London. 
Cost of fitting a forcing flower-house, the back flue being retained, and the hot- 
water pipes traversing only the east end and the front ; the delivery pipe and the 
return pipe being of the same diameter. 
£ 
s. 
d . 
Round Boiler 
. 2 
8 
9 
1 8 yards, 4 inches, round pipe, at 4s. 3d. 
. 3 
16 
6 
Elbow instead of cistern 
. 0 
8 
6 
Country smith fixing joints, &c. 
. .2 
0 
0 
Country bricklayer setting boiler, &c., about 
. 3 
0 
0 
11 13 9 
Cost of a conservatory, about 55 feet long, the delivery and return pipes of the 
same diameter, and placed one below the other, the length of the house. 
Square boiler 
Square cistern 
34 yards, 4 inches, pipe, at 4 s. 3 d. 
Country smith, as above 
Country bricklayer about 
£ s. d. 
. 5 13 11 
. 1 13 9 
.746 
.420 
.400 
22 14 2 
If more heat is required, a double length of delivery pipe would cause additional 
expense of— ~ 
£ s. d. 
17 yards, 4 inches, pipe, at 4s. 3 d. . . . 3 12 3 
Smith, joints, and fixing . . . . .200 
5 12 3 
There exists much difference of opinion respecting the size and form proper for 
boilers, of which we shall have occasion to speak more hereafter. Mr. Saul, of 
