PLEURO-PNEUMONIA. 177 



work, and that of all investigators who had preceded them, 

 would have to be repeated. 



Arloing and others have also found four different organisms : 

 — 1st. A bacillus called by Arloing Pneumdbacillus liquefaciens 

 hovis ; 2d. Three micrococci — (a.) anon-liquefying coccus whose 

 colonies resemble drops of wax — Pneumococcus gutta-cerei ; (b.) 

 a micrococcus the white colonies of which spread in a thin 

 layer, and as this grows older it becomes wrinkled and folded — 

 Piuumococcus lichenoides ; and (c.) a micrococcus whose colonies, 

 elongated or round, assume a beautiful orange tint — Pneumo- 

 coccus fiavescens. Arloing is now of opinion that the Pneu- 

 monia bacillus liquefaciens is the pathogenic microbe of pleuro- 

 pneumonia ; for, by means of subcutaneous inoculations of cattle 

 with pure cultivations of the microbes, it was found that the 

 bacillus produced the greatest effect, and when injected in 

 larger doses pulmonary effects were induced closely resembling 

 those of pleuro-pneumonia. Arloing has repeated his experi- 

 ments, and says — " I have reproduced in the bovine with pure 

 cultures of the pneumobacillus taken between the second and 

 tenth generations the typical alterations produced under the 

 skin or in the chest by the virus of the peripneumonia conta- 

 gosia. I then peremptorily say — {first) that the virulent agent 

 of contagious peripneumonia is an ordinary microbe ; {second) 

 that this microbe is the pneumobacillus liquefaciens bovis." — 

 {Compte Rendus d'Academie des Sciences). Further experiments 

 are, however, desirable. 



BRONCHO OR CATARRHAL PNEUMONIA, CORN-STALK DISEASE, 

 TRANSIT PNELTMONIA. 



Pleuro-pneumonia has been confounded with another disease 

 — broncho-pneumonia, called by American veterinarians the 

 "corn-stalk disease," and transit pneumonia by the Canadians, 

 described by Billings as interstitial pneumonia, following a 

 septicaemia induced by eating decomposing corn-stalks (Indian 

 corn-stalks) — by the veterinary officers of the Board of Agricul- 

 ture and others, and I feel warranted in relating the history of 

 that disease as seen in this country. 



Early in 1879 pleuro-pneumonia was reputed to have been 

 found amongst American cattle landed at Liverpool, and the 



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