250 ON A MODE OF PRODUCING BOTTOM HEAT 
genus. I have added many composite plants to my collection. Soon 
after the rains set in, a beautiful little annual everlasting flower covers 
the tops of the Perongarup hills, in many places giving them the 
appearance of being covered with snow. ‘This little plant would be 
worth cultivating in England, and it would flower long before any of 
the other sorts from seed. I found a very curious plant of this order, 
of a genus different from any other I have before seen in this country, 
and bearing, in leaves and flowers, a considerable resemblance to the 
European Dandelion; it has a single, milky, tuberous root, the size and 
shape of a skirret; one is annually formed, which flowers the following 
year, and, like some of the Orchidee, the tuber which flowered the 
year before, is seen, i an exhausted state, by its side. I have made 
some additions to my collection of Proteacee. A large and showy 
species of Jsopogon grows on the tops of all the Toolbranup hills; I 
suppose it is altogether a larger plant than the L. latifolius of Mr. 
Brown. A remarkable Jsopogon—a stemless species, with downy 
leaves, a foot long, divided as in Franklandia fucifolia—grows about 
the lakes to the east of Toolbranup; anda fine upright-growing thorny 
Adenanthos on the top of low ironstone hills in the same vicinity. In 
botanical characters, it comes near the A. pungens of the Plante 
Preissiane ; but that is a prostrate plant, covering the ground like a 
carpet, while this has no branches near the ground. A very curious 
Grevillea, with smooth, rigid, simply pinnate-leaves, is seen in several 
places by the road-side in going from Cape Riche to the sandal-wood 
stations. I must leave some account of the Endogens I have met with 
to a future opportunity.” 
OBSERVATIONS ON AN EFFICIENT AND ECONOMICAL 
MODE OF PRODUCING BOTTOM HEAT IN STRUC- 
TURES FOR THE GROWTH OF PLANTS. 
BY MR. WILLIAM CHITTY, OF STAMFORD HILL, NEAR LONDON. 
Feetine assured that anything calculated to further the interests of 
gardening, more especially of the floricultural part of gardening, will 
be welcomed by you, I would take this opportunity of saying a few 
words in favour of the mode of producing bottom heat so lucidly 
described and illustrated in the ‘** Appendix to M’Intosh’s Practical 
Gardener,” not but that you and your readers (at least a large pro- 
portion of them) are already acquainted with the mode as there 
detailed, and very many probably with its practical operation and 
excellence, but still it may not be amiss to recal attention to what will 
be found to be not a mere figment, but the most cleanly, economical, 
and efficient mode of heating a forcing house or stove that can possibly 
be introduced, and withal so simple in its management, “ that a child 
might be entrusted with its care.” 
A powerful argument in favour of this mode of producing bottom 
heat, taken in connexion with its efficiency, is the very small cost at 
which such an apparatus can be fitted up, wherever there is a pit 
already existing, which may have been used for the purpose of con- 
