Abstract
In an attempt to determine whether venoms are general in their effect on various types of protoplasm, a study was made of the relative resistance of 14 species of protozoa to the lethal action of Crotalus and Cobra venoms. So far as this group of protozoa is concerned, it was found that the poisonous effect is general; however, much variation in degree of resistance was found to exist among the species. Some had relatively high resistance to one venom and low to the other; or vice versa.