■272 Messrs. Allen and Pepys on the Changes produced in 
Seventeenth Experiment. 
The water gasometer was filled to the usual mark upon the 
scale, with oxygen gas, prepared from about 9 oz. troy, of 
hyperoxygenised muriate of potash, as in the former experi- 
ment ; the gas being examined was found to contain as before, 
2.5 azote, and 97.5 oxygen, in 100 parts. 
The apparatus being found air tight, and all the tubes, &c. 
cleared of atmospheric air by passing oxygen through them, 
the operator prepared himself for the experiment ; but it must 
be noticed that he had been rather fatigued during five hours 
previous to respiring, and had not taken any refreshment ; 
the weather was very warm ; his pulse 86 ; heat under the 
tongue 98-! ; he felt no uncomfortable sensation during the 
process, but experienced a gentle glow and universal per- 
spiration, breathing all the time with great ease, his pulse 
after the experiment was 102, and the heat under the tongue 
99 °' 
Barom. 
Therm. 
Faht. 
Time. 
Cub inches. 0 , . , 
c Cub. inches ^ c • 
of oxygen gas ex oi re d r)eficienc y* 
inspired. ^ 
S °-3 
O 
O 
7 '- 2 5 " 
3420 3362 58. 
The quantities of expired gas taken off in each of the mer- 
curial gasometers were as under, in the order in which they 
were filled. 
1. 
- 
- 
250 cubic inches. 
2. 
- 
- 
290 
3 - 
- 
- 
272 
4. 
- 
- 
238 
5 - 
- 
- 
252 
6 . 
- 
- 
.300 
