NATURAL IMMUNITY AGAINST TOXINS 325
Examples of natural immunity against toxins.—Immunity of spiders
and scorpions against tetanus toxin.—Immunity of the scorpion
against its own poison.—Antivenomous property of the blood of
the scorpion.—Immunity against tetanus toxin in the larvae of
_Oryctes_ and in the cricket.—Immunity and susceptibility of
frogs against this toxin.—Natural immunity of reptiles against
tetanus toxin.—Antitetanic property of the blood of
alligators.—Immunity of snakes against snake venom.—Immunity of
the fowl against tetanus toxin.—Immunity of the hedgehog against
poisons and venoms.—Immunity of the rat against diphtheria
toxin.