LESSON I. APPARATUS FOR STIMULATION.- 

 SENSATION CAUSED BY ELECTRIC CURRENTS. 

 MUSCLES OF FROG'S LEG. 



The Practical work will be preceded by a Demonstra- 

 tion of the apparatus. 



1. The electric current may be taken from a galvanic 

 cell or from an accumulator. 



a. DanielPs cell. Terminal screw on copper plate, 

 the positive pole or anode. Saturated solution of copper 

 sulphate, porous cell containing 10 p.c. sulphuric acid. 

 Zinc plate amalgamated with mercury. Terminal screw 

 on zinc plate, the negative pole or cathode. 



6. Leclanche cell. Terminal screw on carbon rod, 

 the anode. Porous pot containing manganese dioxide. 

 Saturated solution of ammonium chloride. Terminal 

 screw on zinc rod, the cathode. 



Fig. 1. 



