67 
its position in the middle of the wing of the building together 
with its content of over thirty-five hundred cubic feet of air secure 
for it a very equable temperature. This room has been in con- 
stant use for six months including the period of tests of the heat- 
ing system of the building and the total range of as has 
not exceeded four degrees centigrade, and at no time has av 
tion of two degrees been noted in a single week. The nae 
varies from sixty to eighty per cent. in the work now in progress, 
and it has been found to offer much more suitable conditions for 
experimental work than any room used . a similar purpose 
which has come under the notice of the 
A corridor leads from the se ae iapeiateny to the 
class-room between the dark room and the office of the director 
of the laboratories sear s room, Fig. 15). The class-room 
is thirty- y twenty feet, and one end is furnished with such 
eee as to a it suitable for the weekly convention of 
workers from the laboratories. The other end serves for the 
private laboratory of the ee of the laboratories and contains 
the departmental library 
The physiological ene is a skylighted room, thirty-five 
by thirty-two feet, occupying the corner of the building. It hasa 
tone floor set in water-tight cement, a tank for aquatics and 
tables for cultures. An ample heating surface is provided, and a 
special system Ofs steam pipes around under the skylights secures 
ventilation, and acts as a preventive of dripping moisture. Ven- 
vided, while a set of shades may be used to cut off the direct 
rays of the sun. By such means a range of temperature similar 
to that of an intermediate greenhouse is secured. To this 
are brought specimens from the plantations and een He 
experimental and observational purposes, and these are removed 
as soon as the work with them has been 
mall chemical laboratory opens from the ee lab- 
oratory, and leads into the large chemical laboratory occupying 
the corner of the wing. This room has not yet been provided 
with the special furniture and fittings necessary for chemical 
work. It has a large ventilating hood leading into a duct into 
which all of the ventilating flues of the room empty. <A venti- 
