LA BORA TOR Y G VIDE IN PH YSIOL OGY 



VII. To vary the strength of an Electric. Current 



Gradually. Fleischl's Rheonom 48 



VIII. To Determine the Influence of the Kathode 



and Anode Poles 51 



IX. a. The Muscle-Nerve Preparation. 



b. Indirect Mechanical, Thermal and 

 Chemical. Stimulation of the Gastroc- 

 nemius 56 



X. Variations in the Method of Applying 

 Mechanical, Thermal and Chemical 



Stimuli 61 



a. Direct and Indirect Stimulation. 

 I). Qualitative Variation of Stimuli. 



c. Quantitative Variation of Stimuli. 



d. Variation of Length of Time of Ap- 

 plying the Stimulus. 



XL Electricity as a Stimulus. The Galvanic 



Current 75 



XII. Stimulation with the Constant Current. 



The Simple Rheocord 68 



XIII. The Effect of Induced Current. Tetanus. 70 

 XIV. To Determine the Amount of Work Done 



by a Muscle 73 



a. The Work Done by a Single Contrac- 

 tion. 



b. The Total Amount of Work Done by a 

 Muscle. 



c. Reaction Changes in Fatigued Muscle. 

 XV. To Determine the Effect of a Constant 



Current upon the Irritability of a Nerve. 



Electrotonus 75 



XVI. Pfliiger's Law of Contraction . . . . 80 



