432 INFECTION AND IMMUNITY. 



for which an antitoxin can be obtained by immuni- 

 zation. 



Arachnolysin, obtained from the bodies of cer- 

 tain spiders, is a hemolytic toxin, which by immun- 

 ization yields a specific antitoxin. 



A poison, with properties resembling those of 

 snake venorn, may be obtained from the caudal 

 segment of the scorpion. Antitoxin is produced 

 by immunization. 



Ichthyotoxin, a name given to the toxic proper- 

 ties of eel serum, is composed of a neurotoxic and 

 a hemotoxic constituent. 



From the poisonous glands of certain fish 

 (Trachinus draco) a highly toxic, thermolabile 

 substance is obtainable, for which an antitoxin can 

 be prepared by the immunization of rabbits. 



