CKNICRAL CONSIDI-.RATION OF DISI-IASE. 



47 



sites will be discussed under the topic of ^•ital or infective 

 causes of disease. 



Bees, wasps, scorpions, ants and other animal ori^anisms 

 liberate poisonous chemic substances (z(jotoxins) which, when 

 introduced into the animal body cause marked disturbances. 



Poisonous snakes secrete and liberate injurious chemic sub- ■ 



rc\ "^ 



r\^ 







&_- 



Fig. 17. — l>oco (Astrasalus Molllssimusl. 



Stances. The jx.nsonous principle, zootoxin or venom is pro- 

 duced by glandular tissue, and is liberated through canals or 

 grooves m their fangs. The exact chemic composition of venom 

 has not been determined but is not the same in the diiTercnt 

 venomous snakes. Noguchi has classified the principle action 

 of venom as follows : — 



