146 EXPERIMENTAL PHYSIOLOGY. 



(d.) Apply heat to the preparation, and observe that the 

 cork travels much faster. 



3. Anatomy of the Nerve-Muscle Preparation. Before making 



Fig. 50. The Muscles of the left leg Fig. 51. Distribution of the Sciatic 



of a frog from behind. c.i. , Coccy- Nerve (I.) of the Frog (see also Fig. 



geo-iliacus; gl, gluteus ; p, pyri- 50). s.t., Semi-tendinosus ; ad , 



formis ; r.a., rectus anterior ; v.e., adductor magnus ; (II.) its tibial; 



vastus externus ; tr, triceps ; r.i." t and (III.) peroneal divisions, 

 rect. int. minor ; a.m., semi-mem- 

 branosus; 6, biceps; gr, gastro- 

 cnemius ; t.a., tibialis anticus ; 

 pe, peroneus. 



this preparation the student must familiarise himself with the 

 anatomy of the lower limb of the frog. On a dead frog, or on a 



