1868 . ] 
135 
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clarke’s water-jacket tubular boiler. 
18 inches in height, and rich dark green in colour; stipes and rachis black. 
The apex of every frond is frequently divided into several branches, which 
oftentimes are again divided, thus forming a beautiful tassel some 2 or 
3 inches long, which is well represented in the figure. It partakes some¬ 
what of the character of A. cuneatum and A. concinnum, and will become 
one of the very best for bouquets or Wardian cases.” [See opposite.] 
“ GleicJienia circinata cjlauca .—A very fine variety of the preceding 
[G. circinata], differing in being more robust in growth and thicker in 
texture; the young growths and the under side of the fronds are beautifully 
glaucous. Native of New Zealand, &c.” 
CLARKE’S WATER-JACKET TUBULAR BOILER. 
AVING for some time paid great attention to heating garden structures 
3J under a variety of circumstances and with variable success, and 
having some years ago conceived a great partiality for the tubular 
boilers, insomuch as with them, and by burning coke (for which they 
are best adapted), a great nuisance in the shape of smoke and 
blacks falling on the glass and plants was got rid of, I advised my then 
employer, the Earl of Darnley, about the year 1859, to put down three of 
Ormson’s tubular boilers at Cobham Hall. At that time two wrought-iron 
