ON THE TRYPANOSOME OF THE LITTLE OWL. 
143 
examined, in fact, was a young fledgeling, brought into the 
laboratory about the middle of June. This little bird, which 
went by the name of “ Piepsch,” also had no parasites in its 
blood; it, too, was most probably quite free, but it became 
such a favourite that its sacrifice to science was not permitted. 
From our experiences with Rovigno owls we consider it quite 
likely that the birds in this neighbourhood were not infected 
with the protozoan blood-parasites specific to them ; on the 
other hand, we never had more thau two consecutive birds 
sent from Vienna or Breslau which were quite free from 
parasites . 1 
A great difficulty with which we had to contend was that 
the climate of Rovigno did not suit the inland owls, confined 
as they were in cages. As regularly as the periods occurred 
when the moisture-laden Sirocco prevailed, equally regularly 
did one or more of our precious owls die suddenly ; and this 
danger of losing all at once an important bird continued to 
be a source of anxiety the whole time we were there. As a 
matter of fact the investigation would probably have been 
rendered much easier had we gone to Vienna to carry it out. 
There could not have been the slightest objection to choosing 
this district in preference to Rovigno, for in the course of our 
stay we gathered from Giovanni, one of the sailors attached 
to the laboratory, who was there in Scliaudinn’s time, that 
most of the owls which Schaudinn himself used came from 
Vienna. 
Altogether we had eighteen owls sent from Vienna or 
Breslau, the birds being* more readily obtained as the spring 
advanced. The accompanying table has been drawn up to 
show at a glance the number of birds infected, and the 
different parasites present in each case. (Tryp. = Trypano- 
soma, Halt. = Halteridium, Lz. = Leucocytozoon, and Prot. 
= Proteosoma.) 
1 Since our return home we have had a batch of four young owls sent 
from Geneva, all of which have proved entirely negative. This may be 
also an uninfected district. 
