1 Aue., 1901.] QUEENSLAND AGRICULTURAL JOURNAL. 265 
June 24.—Temperature, 40° C. Corpuscles 7,200,000. The animal does not 
appear to be depressed; it keeps up its appetite. The urine is of normal colour. 
zematozoa are rare in the corpuscles. 
June 25.—Temperature 39°. Red corpuscles 6,900,000. Hematozoa still rare ; 
urine clear yellow. The animal is slightly depressed; it eats fairly well. \ 
June 26.—Temperature 38°5 C. Corpuscles 7,000,0000. Hematozoa rare; urine 
normal. The animal is better; its appetite is good. 
June 27.—Temperature, 39°3 C., 6,800,000 red corpuscles. I find no more 
pee oro8 appetite somewhat capricious. I detached several full-grown mature 
ticks. 
June 28.—Temperature, 38°3 C. Nothing found in the corpuscles, the number 
of which is 7,050,000. 
June 29.—Temperature, 38°6 C. The animal is doing very well. 
June 30.—Temperature, 38°7 C. I collected some fifty mature ticks. 
July 1.—Temperature, 38°6 C. 
July 2.—Temperature, 38°8 C. 
July 3.—Temperature, 38°9 C. 
July 4.—Temperature, 38°7 C. The gencral condition of the animal is good. 
I reckon 8,100,000 red corpuscles per m.m.c. Since the 27th June I have not found 
a single hematozoa. 
2._FATAL DISEASE CAUSED BY TICKS TAKEN FROM ANIMALS 
APPARENTLY HEALTHY. 
Arypic Form. 
Bullock, aged 3 years. Common breed. 
On May 6, 1899, I took, in the north of the province of Santa Fé, from animals 
‘apparently healthy and raised in the locality, some ticks completely developed. 
These ticks were placed in small glass vessels at the laboratory temperature (an 
average of 20° C.). They laid their eggs on May 19. ‘Then the bodies of the mothers 
were removed, and the vessels containing the eggs were placed outside, where they 
remained during the whole of the winter.* 
The eggs hatched out during the early days of October. I took about 1,000, 
and. divided them into two fairly equal lots. One lot was placed on a bullock—the 
very one which was the subject of the experiment I am about to describe—on 12th 
October. The other lot was pounded in a sterilised mortar, and the whole was 
injected without filtration beneath the skin of the second bullock. JI may at once 
state that this last beast did not show the slightest alteration in health—nor the least 
symptom approaching those of bovine malaria. Two months afterwards, I inoculated. 
it with a small quantity of virulent blood. which killed it; it was, therefore, in no 
respect rendered immune. [I shall revert to this case further on. 
Let us return to the examination of the bullock which had received the young 
living ticks on its back :— 
October 13.—Iemperature, 38°5 C. The number of corpuscles is 8,600,000. 
= 14.— of 38°7 C. 
5 a Mi 38°5 C. 
” ii ” 38°9 C. 4 
is 17.— 1 39° ©. Number of corpuscles, 8,300,000. 
The ticks have increased in size ; they are now eight days old; their colour is of 
a greenish blue; it is extremely difficult to detect them. ‘The general condition of the 
animal is good. 
October 18.—Temperature, 58°6 C. 
eo i 38°7 C. 
»  20.— # 38°5 C. Number of corpuscles, 8,500,000. General 
condition. good. 
October 21.—Temperature, 38°9 C. 
i” 22.— p 39°4C. I examined the corpuscles very carefully, 
but so far found nothing in them. : 
October 23.—Temp. 39°6 C. Still nothing in the corpuscles. Appetite 
diminished. : 
October 24.—Temp. 40°7 C. Number of corpuscles, 8,200,000. Nothing found 
in them; the urine is of normal tint. There appears a roseate halo round the 
punctures made by the ticks on those parts where the skin is thin and deprived of 
pigment. The animal eats very little. 
* T would state that in South America the seasons are reversed in regard to Europe. 
