ILLUSTRATION 
PLATE 1 
Fic. 1. Normal contractions of isolated cat’s intestine, augmented by the 
addition of 0.5 mil of 1 per cent pilocarpine, ceased after the ad- 
dition of 0.05 mil of the aqueous preparation of Datura alba. 
The contractions returned soon after the solution was changed 
with fresh Ringer-Locke’s solution. Additional amount of pilo- 
carpine slightly increased the intestinal contractions. 
2. Comparison of the effect of Datura alba on the vagus inhibition 
to the heart, with those of atropine and hyoscine. The use of 
0.0025 milligram of atropine or hyoscine and 0.0005 mil of 
the aqueous preparation of Datura alba produced the same ef- 
fect. B. P. indicates blood pressure; B. L., base line; S, stim- 
ulation of the right vagus nerve. 
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