232 
H. M. WOODCOCK. 
exists in the case of the Lencocytozoan and Trypanosome 
parasites of fowls (Sumatra). So far as regards Mayer’s 
account of the development of Trypanosomes from Halter- 
idia, I shall have to criticise this in a later memoir; here I 
must confine myself to a brief consideration of the above- 
mentioned paper by Prowazek. 
In the first place, it is impossible not to comment upon the 
appearance presented by the parasites in the figures on 
Prowazek’s plates. I have pointed out above how frequently 
the figures hitherto given of Leucocytozoon have 
represented poorly fixed or stained specimens ; but I do 
not i-ecollect ever having seen any which are quite as bad as 
some of those on the plates in question. Speaking for 
myself, it is no exaggeration to say that, from many of the 
figures, taken by themselves, it is impossible to tell what 
they are meant to represent, so dreadfully are the parasites 
distorted and disorganised. It is obvious that no conclu- 
sion or interpretation can be accepted which is based upon 
preparations such as those from which these figures are 
taken. 
Minchin and Woodcock (4), in their paper published only a 
month or two before Prowazek’s appeared, and which pre- 
sumably that author had not seen, have fully discussed the 
subject of the possible connection of Leucocytozoon 
ziemanni and the trypanosome of the little owl — the very 
parasites, i. e., on which Schandinn worked — but it is not out 
of place to repeat here the main conclusions at which we 
arrived. In spite of numerous and prolonged living examina- 
tions we never obsei'ved the least sign of the passage from 
one form into the other — in either direction ; nor is there the 
slightest evidence to this effect in any of our permanent pre- 
parations. The better fixed and stained these are, the more 
closely the Leucocytozoon agrees in form with the appear- 
ance presented in the living condition ; it is remarkably 
uniform, and scarcely varies at all. 
I may mention here a point which I have not referred to 
in the preceding pages of this note with regard to the true 
