89 
Fig. 45. 
Warm Chamlber. 
No. 
Marks 
It consists of a maliogany box enclosing the whole stand in 
a nearly air-tight manner ; in the anterior wall is a glass window 
to admit the necessary incident light; on both sides are closely 
fitting doors to allow of the specimen being moved by the hands. 
The whole stands on a thick metal plate and tripod. The former 
is heated from below by a gas-burner controlled by a thermo- 
regulator. The temperature inside the box is observed by a 
thermometer and may be raised up to 45 C without detriment 
to either stand or objectives. (Fig. 45.) 
