11 



The membrane from fowls consists almost entirely of pus cells, 

 some granular masses, debris of epithelial cells (especially swollen 

 nuclei of these), and bacteria ; but amongst the bacteria, we seldom 

 find one that can be stained by Gram's method. 



Roupy fowls never show any of the symptoms caused by the 

 bacterial toxin (poison secreted by bacteria,) which usually follow an 

 infection with the true diphtheria bacillus. 



m 



Fig. 7. — Fowl 46 ; throat and bottom of the mouth witli 

 false membrane (;;*), fourteen days after inoculation w-ith 

 B. pyocyaneus. 



Hence we are bound to conclude, from the evidence here presented, 

 and from other evidence we have at hand but which space alone pre- 

 vents us from presenting, that Stevenson's theory is untenable, and 

 that fowl diphtheria is never caused by the human diphtheria germ, — 

 the Klebs-Loeffler bacillus. 



Results of Work at College. 



In the present bulletin, only a brief summary of our work with 

 roupy birds can be given. Any one wishing the full details of the 

 exp rimental work may obtain them by writing to the College for 

 the full report. 



