PHYSIOLOGICAL ACTION, AND ANTAGONISM. 
241 
Fig. 13. a. Normal gastrocnemius. Direct stimulation. 
b. Ditto. After 30 m in '33 per cent, chloride of lithium. 
Fig. 14. a. Normal gastrocnemius. Direct stimulation. 
b. Ditto. After 30 m in '1 per cent, chloride of potassium. 
c. Ditto. After 30 m in '15 per cent, ditto. 
Fig. 15. a. Normal gastrocnemius. Direct stimulation. 
b. Ditto. After 30 m in '25 per cent, chloride of barium. 
c. Ditto. After 45 m in ditto. 
d. Ditto. After 15 m in ‘25 per cent, chloride of potassium. 
Fig. 16. Frog poisoned by chloride of erbium (slow action of drug). 
a. Ligatured ]eg. Direct stimulation. 
b. Poisoned leg. Direct and indirect stimulation give equal contractions. 
Fig. 17. Frog poisoned by chloride of lanthanum. 
a. Ligatured leg. Indirect stimulation. 
b. Poisoned leg. Indirect stimulation. 
Fig. 18. Frog poisoned by chloride of yttrium (slow action of drug). 
a. Ligatured leg. Indirect stimulation. 
b. Poisoned leg. Ditto. 
Fig. 19. Frog poisoned by ’35 grm. calcium chloride. 
a. Ligatured leg. Indirect and Direct stimulation give equal contractions. 
b. Poisoned leg. Indirect stimulation. 
c. Ditto. Direct stimulation. 
PLATE 9. 
Fig. 20. 
Fig. 21. 
Fig. 22. 
Fig. 23. 
Fig. 24. 
a. Normal gastrocnemius. Direct stimulation. 
b. Ditto. After 20 m in 1 per cent, chloride of didymium. 
a. Normal gastrocnemius. Direct stimulation. 
b. Ditto. After 30 m in •2 per cent, chloride of strontium. 
c. Ditto. After 15 ra in ‘5 per cent, ditto. 
a. Normal gastrocnemius. Direct stimulation. 
b. Ditto. After 20 m in 1 per cent, chloride of beryllium. 
Frog poisoned by beryllium chloride ('02 grm.). 
a. Ligatured leg. Tetanus of gastrocnemius, direct stimulation. 
b. Poisoned leg. Ditto. Secondary coil at 2 c.m. Indirect stimulation of 
the poisoned muscle did not yield any contraction. 
Action of heat and cold on the barium curve. 
a. Normal gastrocnemius. Direct stimulation, at room temperature 13° C. 
b. Ditto. After 15 m in '25 per cent, chloride of barium solution. Tempera¬ 
ture 13° C. 
2 I 
MDCCCLXXXIY. 
