216 Proceedings of the Royal Society 
of being supplied with ozonised air, they received ozonised oxygen. 
When a mouse breathed an atmosphere of pure oxygen, it became 
exceedingly active in its movements. It ran about examining 
every part of its prison, and breathed with such rapidity as to 
make it impossible to count the number of respirations taken during 
a minute. When the oxygen was ozonised, the mouse quickly 
showed the usual phenomena of the closed eyes and the reduction 
of the number of respirations, but it lived for a much longer period 
than in ozonised air. Instead of dying at the end of fifteen or 
twenty minutes after the introduction of the ozonised atmosphere, 
it lived for thirty-five or forty minutes. The number of respirations 
per minute became smaller, and the animal died in severe general 
convulsions. The blood, when examined quickly after death, has 
been found venous in all parts of the body. In both experiments, 
the temperature of the body was found to be much reduced. 
As the reduced temperature of the body in these experiments 
might have been owing to the current of gas passing quickly 
over the bodies of the animals, two experiments were made, in 
which the glass air-chamber was immersed in a water-bath kept at 
a temperature of SO 0 C. The animals were supplied with atmo- 
sphere at the rate of 13 cubic inches per minute. The general 
results were the same as in the experiments made without the 
water-bath, but the temperature of the body on death was still 
below the normal. 
Various experiments were also made on rabbits, with the same 
general results as in the case of mice. There was evident irrita- 
tion of the eyes, causing closure of the lids, and the exudation 
from between their margins of a whitish fluid, probably lachrymal 
secretion. The respirations were reduced in number from 100 or 
110 to from 36 to 30 per minute. In one experiment, only the 
head of the rabbit was introduced into a glass vessel, into which 
the stream of ozonised oxygen was transmitted so as to allow the 
experimenter to count by touch the number per minute of the pul- 
sations of the heart. The result was, that immediately on the in- 
troduction of ozone the number of pulsations was much diminished, 
and the force of the contractions of the heart was so enfeebled that 
it could not be felt through the wall of the thorax. Still, in the 
bodies of rabbits killed in an atmosphere of ozonised air, or of 
