452 VETEEINAEY HYGIENE 



possible at present to cultivate these artificially. It is 

 now thought that the Spirillse belong to the group 

 Sporozoa, rather than the Bacteriaceas. 



The Streptothrices are a connecting link between the 

 bacteria and the moulds. By some they are not regarded 

 as a distinct species, but as allied to the moulds. The 

 principal organisms belonging to this group are the 

 Streptothrix bovis which produces actinomycosis ; the Strp. 

 farcinica which causes the disease in Guadeloupe known 

 as mal de Guadeloupe ; the Strp. necrophora, found in 

 several diseases of the domesticated animals often as 

 a secondary infection, and commonly known as the 

 bacterium of necrosis. It is now believed that the bacillus 

 of tuberculosis should be classed as a Streptothrix, on 

 account of the branching threads which have been observed 

 in pure cultures, but other authorities contend these 

 branches are simple involution forms. 



Bacteria which are described as ' acid fast,' from their 

 power of retaining acid dyes, are also described as belonging 

 to this group. 



These acid-fast bacteria are of some importance, as they 

 have repeatedly been found in milk and may be mistaken 

 for the real pathogenic tuberculosis microbe. 



Up to lately it was accepted that the tubercle bacillus of 

 men and animals was identical. Professor Koch, however, 

 expressed the opinion that human tuberculosis was not 

 inoculable in cattle, and in consequence believed the converse 

 to be equally true. The most recent experiments show 

 that there are certain tribes, or varieties of human tubercle 

 which are capable of producing generalized tuberculosis 

 in cattle. 



The Hypihomycetes or moulds are true fungi, they consist 

 of simple or branched filaments which bear spores, and 

 according to the formation of the spore bearing organ so are 

 moulds divided into Aspergillus, Penicillium, and Mucor. 



Some fungi are pathogenic, for instance, the Trichophy- 

 ton tonsurans and Achorion Schonleinii which produce ring- 

 worm. Moulds have also been found in the bronchial tubes 



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