ELEMENTARY PHYSIOLOGY. [iX. 



2. The negative variation of the currents of the 

 muscle during a contraction (action currents) 



3. The rheoscopic frog 



4. Action of heat and cold on the single muscular 

 contraction 



5. Action of veratrin on the single muscular con- 

 traction 



6. Curve of elasticity of muscle 



7. Measurement of latent period of contraction 

 of muscle by means of pendulum myograph. 





