Mr. George S. Hudson 195 
arrangement erected at the Botanic Station, 
Dominica, by the Imperial Department of 
Agriculture for the West Indies. Its idea 
originated with Mr. Whitfield Smith, now 
Commissioner of Carriacou. As erected at 
Dominica, the building consists of a large 
open shed covering an inner wooden building 
containing six large cacao trays on wheels and 
rails} arranged in three planes of two trays 
each, with an outer extension of iron rails 
whereby the six trays can be pulled out and 
their contents thoroughly turned over and 
picked over without danger of wetting from 
rain. There is, however, no arrangement by 
which sun heat may be utilized. The interior 
building, with its tray shutters, is made air- 
tight as far as possible, and at one end hot 
air is led into the lower plane of two trays from 
a No. 28 iron “Comet” stove (made by the 
J. L. Mott Iron Works, 84, Beckman Street, 
New York—cost about $40); this hot air 
is confined to the lower plane by a ceiling 
until it reaches to within 18 in. of the end 
of the building, when this space is left open in 
the ceiling to allow its ingress into the second 
or middle plane of two trays. The ceiling 
above this middle tier is also closed to within 
18 in. of the opposite end, thus forcing the 
hot air to travel over and under the trays, and 
the process is repeated in the top plane, at the 
further end of which is placed an 18 in. 
Blackman ventilating fan (cost about £5, 
