21 
was also noted that following the primary injection the later injec- 
tions caused much less weakening of the heart. For example, a 
preliminary dose of 1 gram lessened the amplitude 70 millimeters, a 
second injection only 38, a third injection of 1.5 grams 36, and a 
fourth also of 1.5 grams only 8. Figure No. 1 is given to illustrate 
