44 
Blood Parasites 
consisting of granules or threads which stain a paler colour than that 
of the female, and near the mai’gins two or three grains may sometimes 
be found which stain more deepl}^ with Giemsa. These structures 
are evidently those which were regarded by Schaudinn and others 
as centrosomes, but which Woodcock considers to be karyosomatic 
elements. 
The average measurement of the leucocytozoa is about 10 /a in 
diameter—whilst the host cell is about 15 ya—but they may be 
considerably larger than this. 
The formation of flagellating bodies and ookinetes was seen in 
fresh preparations and these bodies were also found in stained films. 
(Plate III, figs. 30 and 31.) 
The internal organs of some of the infected blackbirds and thrushes, 
viz. the spleen, bone marrow, lung, etc. were examined, but I have not 
been able to detect any figures of schizogony of the leucocytozoa 
resembling those which Fantham (1910) has described in the spleen in 
the case of Leucocytozoon lovati, but in one thrush I found peculiar 
granular bodies in the blood which I think may represent forms of 
multiplication in the leucocytozoon of that bird. 
Schizogony of Leucocytozoon of the Thrush. 
In the blood of the thrush, which has been mentioned before, which 
was shot on August 29,1911, locally and which contained a mixed infection 
of: Proteosoma, large infection; Halteridia, very few; Leucocytozoa, 
few; Trypanosoma, small and large; and F’^7a?’^a, numerous embryos; 
I found a few large bodies containing large red nodules. These bodies 
were found in (a) the peripheral blood taken from the axillary vessels, 
(b) the blood from the heart, and (c) in smears from the lung. The 
films from the axillary vessels were made immediately after death, those 
from the heart and lungs some two hours subsequently. 
As to the frequency of these bodies : in all 21 films were made from 
this bird, one from the lung contained 17 ; 8 from the blood of heart 
contained 11 ; and 12 films from the axillary vessels contained 4 of 
these granular bodie.s. It will be seen that more than half of these 
peculiar bodies were found in the one film made from the lung, whilst 
only four actual specimens, and these are not so striking in aspect, from 
the numerous films made from the peripheral vessels. 
The.se structures are round, oval, or somewhat irregularly shaped 
bodies staining a blue colour with Giemsa, and contain a number of red 
stained bodies. (Plate III, figs. 33 to 44.) 
