244 DRS. T. L. BRUNTON AND J. T. CASH ON CHEMICAL CONSTITUTION. 
Fig. 43. a. Curve of gastrocnemius which has been 20 m in barium chloride solution, 
1-600. 
b. Ditto. After 15 m in chloride of potash solution, 1-600. 
c. Ditto. After 30 m in ditto. 
Fig. 44. a. Curve of gastrocnemius which has been 80 m in chloride of lithium solu¬ 
tion, 1-300. 
b. Ditto. After 15 m in chloride of sodium solution, '75 per cent. 
c. Ditto. After 30 m in ditto. 
cl. Ditto. After 15 m in chloride of potassium solution, 1-800. 
Fig. 45. a. Curve of normal gastrocnemius. Direct stimulation. 
b. Ditto. After 30 m in chloride of strontium solution, 1-150. 
c. Ditto. After 15 m in chloride of.calcium solution, 1-150 
Diagrams of muscle chamber, A and B. 
a. a. Influx and efflux tubes for solutions. 
b. Vulcanite lid cemented into cork which closes the upper end of the chamber. 
c. Sliding clamp which fixes the femur moved by milled-headed screw (d). 
e. Clamp for carrying wire for direct stimulation. The second connexion is made 
through the coiled wire (f), terminating in a hook ( g ) which passes through 
the tendon of the muscle. 
h. Electrodes for stimulation of the nerve. 
i. Metal cap closing central opening in stopper. 
Tc. Accessory escape or oil tube. 
1. Tube with hour-glass contraction, through which thread connecting tendon and 
lever works. 
