PLEUKO-PNEUMONIA. 185 



tions in which are physically similar to those of contagious 

 pleuro-pneumonia. I have had cases, the circumstances attend- 

 ing the origin of which, as well as the consecutive circumstances, 

 left no doubt in my mind with regard to this. And apart fron) 

 inoculation, which is not always practicable, I did not know 

 until then of anything that had been published that informs us 

 how we can differentiate between what is specific and what is 

 not. Nevertheless, this means is, if not always constant, at 

 least so in the majority of cases. To find it, it is only necessary 

 to make an attentive and minute examination of all the 

 periphery of the diseased parts ; if only for a few centimetres, 

 we find an interlobular exudation advancing into the soft rosy 

 tissue, we may be certain that we have before us the contagious 

 pleuro-pneumonia. It is less with the view of rectifying the 

 above error than of establishing this indication that I request 

 the insertion of this short note." 



Further, in order to prove the catarrhal theory, M'Fadyean says 

 that the piece of lung brought to me by Dr. Wray might have had 

 broncho as well as pleuro-pneumonia. I do not deny the possi- 

 bility of the two conditions being sometimes — but, as a matter of 

 fact, very rarely — co-existent ; but it is a remarkable thing that 

 the very many specimens of American and Canadian lungs that I 

 have seen since the commencement of 1879 should all have been 

 catarrhal, and the many hundreds of pleuroed ones that I have 

 seen in this country should have the catarrhal conditions 

 absent, and since then I have received a portion of another lung 

 from Dr. Wray, in which the lesions are identical with those 

 found in the 1891 lung. Portions of this lung were sent to 

 M. Nocard, who kindly examined them, and I now append his 

 opinion : — 



" AxFORT, 29th December 1891. 



" My Dear Colleague — You will excuse my not having replied 

 sooner, but I did not wish to limit myself only to an examination of 

 the sections you sent me ; for I was desirous of thoroughly studying 

 the piece of lung you also forwarded. This study I have now made 

 comparatively, with pieces I myself collected at the commencement 

 of this year or end of 1890 from American cattle, the history of 

 which I brought before the Societe Centrale Veterinaire in July last 

 under the title of ' Infectious Broncho-Pneumonia.' 



" I have made a great number of sections of your specimens 

 and of my own, and have treated them by the same muthuds of 



