390 



Mr. C. H. Martin and Miss M. Kobertson. [June 18, 



from A to B consists in a splitting off of a free flagellum from the 

 undulating membrane, this flagellum splitting again to form the three anterior 

 flagella of the later stage. This would appear to explain the difference 

 between the two types of B movement mentioned above, the forms with 

 posteriorly directed flagella representing the early stages of this transition 

 from the A to the B form. The differences between B and C are at first 

 sight very marked, but it is interesting to note that C forms, with the 

 rudimentary undulating membrane, a line, and a nucleus approximating to the 

 B £ype, were met wi£h. 



Infection. 



Every fowl which we examined was infected by one or other of these 

 flagellate forms, usually in large numbers, as is shown in the following 

 table. 



Fowl. 



Date. ; Locality. 



Condition. 



Caecal contents. 



Rectal contents. 



Flagellates. 



II 



III 



IV 

 V 



VI 

 VII 



VIII 

 IX 



X 

 XI 



15.4 



17.4 



19.4 



20.4 

 20.4 



20.4 

 21.4 



24.4 

 24.4 



24.4 

 25.4 



Great House, 

 Abergavenny 



Holley's Farm 

 Abergavenny 



Limavady, 

 County Derry 



Holley's Farm, 

 Abergavenny 



Llanfoist 



Llanfoist 



Great House, 

 Abergavenny 



Llanfoist 



Limavady, 

 County Derry 



Llanfoist 



Limavady, 

 County Derry 



2 years old ; 

 fat 



Old hen 



Old hen ; 

 very fat 



Old hen ; 

 fat 



Chick ; 

 60 hrs. after 

 hatching 



Old hen 



Old hen ; 

 very fat 



Chick ; 

 10 days 



Old hen ; 

 very fat 



Chick ; 

 10 days 



Old hen ; 

 very fat 



Light brown liquid, with gas 

 bubbles ; vibrio abundant 



Dark and of an almost earthy 

 consistency ; numerous bac- 

 teria and cocci 



Light brown fluid ; numerous 

 gas bubbles ; H 2 S ; plump 

 bacteria numerous 



Caecal contents dark and firm 



Ceecal contents dark and firm 



Brown fluid contents 



Firm and dark 



Firm and dark 



Brownish fluid 



Brownish fluid 



Brownish fluid .'. 



Darker ; more solid 

 in small quantity 



Full of consistent 

 matter 



Same as caecum .... 



Almost empty 



Ready to defecate . 



Rectum empty .... 

 Recently defecated 



Just about to defe- 

 cate 



Dark solid mass, 

 largely composed 

 of husks 



Empty 



Dark solid mass, 

 mostly husks 



Spirochsete 

 present, 

 A, B, C. 



A, B, D. 



A, B, C. 



B, C. 

 C. 



A, B. 



B, C. 

 Numerous 



cysts. 



A, B, C. 



C. 

 A, B, C. 



