21 



83. Two thermometers graduated in degrees C, from 

 -10 to 310 and 380. degrees respectively. 



Lent by the Biological Laboratory, Royal College of 

 Science. 1878. 



84. Measuring tube graduated in fifths to 50 cc. 

 Lent by the Biological Laboratory, Royal College of 



Science. 1878. 



85. Three burettes, with stopcocks graduated in tenths 

 to 60 cc. 



Lent by the Biological Laboratory, Royal College of 

 Science. 1878. 



86. Two hydrometers, graduated on ivory. 



Lent by the Biological Laboratory, Royal College of 



Science. 1878. 



87. Apparatus for artificial respiration. 



Lent by the Government Grant Committee of the Royal 

 Society, 1891. 



88. Water-motor for driving small machinery,. 

 Made by the Cambridge Scientific Instrument Company. 



E. 145.--1888. 



ii. Apparatus used in Experiments on Muscle and Nerve. 



89. Old form of moist chamber for muscle and nerve 

 experiments. 



Lent by the Biological Laboratory, Royal College of 

 Science. 1878. 



In this apparatus a small tray can be raised or lowered upon a 

 vertical rod. There is a clamp to hold the bone to which the 

 muscle is attached, and a bar upon which the electrodes slide, 

 with binding screws for the wires conveying the current. The 

 muscle and nerve are covered by a bell glass. 



90. Moist chamber of improved pattern. 



Made by the Cambridge Scientific Instrument Company 

 E. 177. 1888. 



There is a simple arrangement for placing the electrodes in 

 position without the use of adjusting screws. The supports are 

 perfectly inelastic and hence when placed in position do not 

 spring away from it. The glass case is oblong in form, and may 

 be charged with moist air immediately on placing the preparation 

 in position. 



