214 
JOURNAL OF HORTICULTURE AND COTTAGE GARDENER, 
[ March 17, 1881 
moistened at pleasure. If dry air is desired, chamber n is left dry ; 
if moist a small quantity of water is poured in, sufficient to come up 
nearly to the top of the air-pipe (see section) ; and this water, being 
in contact with the top of the hot-water coil, becomes warm and 
gives off a gentle moisture. 
“ This coil is invaluable for hothouses of all kinds, particularly 
forcing houses and vineries, as it enables them to be thoroughly 
ventilated in the most inclement weather without opening lights 
and sashes, as is necessary under the ordinary arrangements, thus 
avoiding the danger and damage to the crops too often caused by 
cold draughts. 
“ It may also be used as a fumigator for destroying insects, &c. 
Fig. 50. 
By burning the substance with the fumes, of which the air is to be 
impregnated at the mouth of the air channel, the building may be 
rapidly and thoroughly charged with any odour that may be neces¬ 
mode of increasing an apparatus of deficient power would be by in¬ 
serting one or more of these coils as might be found necessary (see 
fig. 52). This could be done with very little trouble, and only 
slight alteration of the existing work. 
“ One of the chief merits of this invention is that there are no 
fans or machinery for forcing in air. It is self-acting, requires no 
valves and no attention ; but so long as the circulation continues it 
must perforce perform its work in an efficient manner. 
“ The utility of this coil is not confined to horticultural structures ; 
sary. In the same manner the plants may be fed with ammonia or 
other essence if desired. 
“It can be fixed to any existing apparatus ; in fact, an admirable 
for, in the form of fig. 50 it is admirably adapted for schools, churches, 
hospitals, prisons, halls, staircases—in fact, all classes of buildings 
whether public or domestic. It supplies an urgent and long-felt 
want—viz., a simple and satisfactory method of introducing pure 
warm air into buildings without draughts. It is particularly valu¬ 
able for hospitals and sick rooms, for (as before explained) it not 
only induces a constant change of air, but enables them to be 
thoroughly disinfected at pleasure. 
“It may be mentioned that the doors or flaps marked D D, in 
