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 

 1 8 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. 

 Blackmail ventilating fan (cost about 



