Abstract
Summary
1. The parotoid secretion of the spadefoot toad (Scaphiopus holbrookii holbrookii) has no digitalis-like effect, but it stimulates the isolated rabbit's intestines and the isolated guinea pig's uterus. 2. The spadefoot toad, like the nebulous toad, Bufo valli-ceps, is definitely more resistant to ouabain and cymarin, and only slightly more resistant to coumingine HC1, as compared with the Leopard frog, Rana pipiens. 3. The tree frog, Hyla cinerea cinerea, is less susceptible to cymarin than the frog, but almost equally susceptible to ouabain and coumingine HC1.
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