344 H. M. WOODCOCK. 
matter a step further, and obtained the development of un- 
mistakable ''rypanosome phases in cultures from a Piro- 
plasma of cattle in Japan. Hence, the occurrence of this 
feature in Halteridium even regarded by itself is, to my 
mind, most suggestive ; and it is with very great pleasure 
that I bring forward what is, I believe, the first definite 
piece of evidence tending to confirm one, at all events, of 
Schaudinn’s celebrated conclusions. 
TExtT-FIGs. 8-10. 
8 9 10 
Trypanosomes from a bone-marrow smear. In 8 the flagellum is 
very faintly stained, and its course along the side of the body 
cannot be followed. A. Kinetonucleus. 7. Trophonucleus. 
x 2500. 
Stimulated by this discovery, I have striven to find some 
phases showing the actual passage froma Halteridium-form 
to a T'rypanosome-form, but in the case of the parasites of the 
chaffinch such phases appear to be very few and far between. 
This is, unfortunately, only what might be expected from the 
creat scarcity, comparatively, of the 'l'rypanosomes themselves. 
I have obtained certain indications, which, so far as they go 
) Pd y. ao) 
point to such a transformation, or fit in with it; and I have 
observed nothing which in any way invalidates this view. 
Before leaving the Halteridium side of the question, 
there is one phase which I have found, to which I attach con- 
