1899] APPLIANCEFS OR PHYSIOLOGY 257 
ward it dips down to enter a shallow (one inch deep) tin box which 
hangs from it by one cross wire and two stubs, as in the figure. 
Both stage and box taper forward to one inch and one and one 
half inches respectively, a feature not necessary though it dimin- 
ishes leverage when the box is full. A battery clamp, properly 
filed, holds the apparatus to the stage of the microscope, and 
amat of felt between’ prevents conduction of heat to it. The 
Fic, 1.—A temperature stage. 
Ordinary 
mary thermometers necessary for other purposes about a 
laborat 
be Gad ee used, or bent ones, more easy to read, may 
the tem €d at little advance over the straight kind. To raise 
Spirit oo the box is filled with water and heated wy 
Every de Ps to lower it, the box is filled wish ice and : 3 
2€T9 + a of temperature may thus be obtained, from eed 
SaNtia or oo If the student, observing stamen-hairs of Tra a 
ticking a itella, uses an eyepiece micrometer and a a 
Me the rate of movement under each paar : 
© may be obtained with the greatest nicety. e 
