215 
of Edinburgh, Session 1873-74. 
Birds . — A green linnet was put into the chamber, supplied with 
a strong current of air. At the end of five minutes, after the bird 
had become quiet, the respirations were 50 per minute. The air 
was then ozonised. In thirty seconds, the eyes were closed ; in one 
minute, the respirations were reduced to 30 per minute; four minutes 
thereafter, the respiration was slow and gasping, and the number 
of movements 15 per minute ; and in ten minutes, that is, fifteen 
and a half minutes after the introduction of ozonised air, the bird 
was dead. On opening the body, there was venous congestion of all 
the viscera. The lungs were of a dark purple colour, and showed 
a mottled appearance. The heart was still pulsating feebly. It 
was full of venous blood. The brain was pale. The blood cor- 
puscles, when examined microscopically, were normal. 
Mammals . — Several experiments were made on white mice and 
rabbits. With regard to mice, the general effects will be under- 
stood by detailing one experiment. A full-grown and apparently 
healthy white mouse was introduced into a vessel through which a 
stream of air was passing at the rate of 8 cubic inches per minute. 
Five minutes thereafter, the animal was evidently at ease, and the 
respirations were 136 per minute. The air was then ozonised. 
One minute after, the respirations were somewhat slower, but could 
not be readily counted, owing to the animal moving uneasily about 
and rubbing its nose with its fore paws. In four minutes from the 
time of introduction of the ozone, the respirations were 32 in a 
minute. The mouse now rested quietly, occasionally yawned, and 
when touched by a wire, moved, but always in such a direction as 
to place its head away as far as possible from the stream of ozonised 
air. At the end of fifteen minutes, the animal became excited, ran 
rapidly backwards and forwards, and then had a convulsive attack. 
It died, much convulsed, nineteen minutes after the introduction of 
the ozone. The body was colder than natural. There was venous 
congestion of all the abdominal viscera. The heart was still feebly 
pulsating, and the right auricle and ventricle were full of venous 
blood. The left side of the heart contained a small quantity of 
venous blood. The sinuses of the brain were full of dark blood, 
and the surface and base of the brain was traversed by vessels con- 
taining dark-coloured blood. 
Two experiments were also made upon mice, in which, instead 
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