58 



EXPERIMENTAL PHARMACOLOGY 



femur and thigh muscles, but leave the sciatic nerve intact 

 and attached to the gastrocneinius muscle. Cut the tibia 

 and fibula just below the knee and free the gastrocnemius 

 from the remaining tissues of the leg. 



Fig. 51. Harvard muscle lever. 



The cut end of the femur should now be fastened in the 

 clamp of a moist chamber (Fig. 50) and a pin hook is passed 

 through the tendo Achillis as illustrated. The thread 



Fig. 52. Harvard gas chamber. 



passes down to a muscle lever (Fig. 51) which writes on 

 a smoked drum. A gas chamber (Fig. 52) held in a burette 

 clamp (Fig. 30) is placed in position near the muscle (to the 



