76 Causes of Disease. 



Trypanosoma Theileri, African cattle plague. 



[ " Gamhiense, African sleeping sickness in man.] 



Plasmodium malaria equorum, African equine malaria. 



[Plasmodium of human malaria — tertian, quartan and a^stivo- 

 autumnal types.] 



Piroplasma bigcminum, epidemic haemoglobinuria of cattle, 

 deer and sheep. 



Piroplasma caninum, infectious jaundice of dog. 



Sarcosporidia major and minor, parasites of muscle and cel- 

 lular tissue in swine, cattle, sheep, goats and horses. 



Coceidium oviform e. dysentery of cow, intestinal and biliary 

 duct parasite of rabbit (also in man and dog). 



Diseases Due to Mould Fungi. 



Moiiilia eaitdida, thrush in man and birds. 



Trichophyton to)isura}is (numerous varieties), bald patches in 

 cow, man and dog. 



Achorion Selionlcinii (numerous varieties), favus in man and 

 lower animals. 



Dermatomyces gallinarum, scab of cock's comb. 



Aspergillus fumigatus, pulmonary mycosis in birds (excep- 

 tionally in horse and cow). 



Animal Parasites. 



Food and conditions favorable to the existence of a variety 

 of animals and plants are afforded by the human and animal 

 bodies, both in the fluids and tissues, and, too, in the nutrient 

 ingesta and in the excretory and waste matter. When some organ- 

 ism both acquires its nutrition and resides upon or in the body 

 of another individual the condition is spoken of as parasitism 

 (Trapa along with ; <^^-ros. food). A parasite, therefore, is a form 

 of life zi'hieh either transiently or pernianentl\' lives upon or 

 in the body of another organism for the purpose of obtaining its 

 nutritio)i tJierefrom (Braun. Heller). 



According to their origin from one or other of the two kingdoms in 

 nature, they are separable into vegetable and animal parasites ; those which 

 hve on the surface of the body are spoken of as ectoparasites or external 

 parasites (epiphytes, epizoa), those whose habitats are within the body 

 as internal parasites or entoparasites (entophytes, entozoa). 



In the preceding chapters the discussion concerned infestment 



