54 
In order to attack them through the blood arsenic was 
employed. A pigeon received one dram of Fowler's 
solution by mouth with no embarrassment. The golden- 
naped Amazon above mentioned which had received 
thymol received two such doses, one on February 7th, 
again on February 21st. On February 28th could find 
but one egg per smear by improved method. 
Thinking that arsenic might not be well absorbed by 
the bird's digestive tract, five minims of Fowler's solu- 
tion was given hypodermically to a pigeon. In twenty 
minutes it was dead. This method, therefore, seems 
impracticable. Atoxyl was tolerated much better. Ten 
minims hypodermically caused vomiting and diarrhoea. 
Fifteen minims caused death over night. 
The next step will be to administer the atoxyl and 
thymol simultaneously. Salvarsan is kept in mind. 
Summary: Aside from negative findings the experi- 
ments have disclosed : — 
First. — A fairly certain method of identifying ver- 
minous birds, resulting in their isolation. 
Second. — That the ova hatch in 4 to 6 days, best in tap 
water at room temperature. 
Third. — That thymol reduces the number of ova in 
the dejecta. 
Osteomalacia. 
Under this term is included all the softenings of bone. 
It is not an easy matter in all cases to differentiate sharply 
between a true rachitis or insufficient bone deposite, and 
an overactive bone destruction. One of the last cases 
of this sort concerned a Weeper Cebus, young but 
probably of almost completed development. The long 
bones, including the ribs, were of almost completed 
development, while the epipyseal joints were irregular and 
the marrow hyperemic. This particular monkey had been 
here for some time and had always appeared to thrive. 
We have had four osteomalacia cases in 1911 and 1910, 
three in 1909, four in 1908. While these numbers run 
