242 Miscellaneous Intelligence. 
the said record departs (if at all) from what it ought to have been 
as calculated from ihe actual CO,. To do this we may employ 
the — pane of the different classes, taking No. 1 (fresh) 
as unity, t 
pia Sensation. Value. 
INO. 3; Break. oe ie: 1:00 
2 Rather close oo. #18 
3. Close - fet oe ae 
4, Extremely close _.._-. 4°66 
Taking each oe and dividing the a fone ay the mean 
quantity of No. 1, viz: 071943, we get an mber which will give 
the theoretical value of its effect upon. the senses; aa by compar- 
ing this with the actual value of the recorded sensation, we can 
note whether the difference is plus or minus, if any. All observed 
quantities of CO, below 0°1943 are considered i ae to that num- 
ber, and all quantities above 0-9054 as equal to it, as the sense of 
smell does not seem capable of differentisting quantities except 
Out of 458 fully recorded cases, 186 gave a recorded sensation 
in excess of the theoretical value—that i is, the air seemed less pure 
than would have been expected from its CO,. In these the aver- 
age temperature and humidity were both above Class 
152 cases gave a recorded sensation Jelow the theoretical value 
—that is, the air seemed purer than would have been expec 
from its CO,. In those cases the av erage prep ven: was above, 
but the ied 38 humidity below the mean of Clas ded 
120 cases gave a recorded sensation that ane correspon : 
with the theoretical value. In those cases the average temper 
— was above, and the average humidity below the mean 
lass 
Arra angin g these results and putting F for the temperature is i 
grees of Fahrenheit, and H for the humidity per cent, we bav 
roscer yes ie 
e rded and the 
+ 58°°6 F + 86 H = + 197.70 [1] \ Rergaisgr yeh 
+ 230°3 F — 82 H = — 117°37 [2] Do. 
+ 2440F —91H= 0 [3] Do. 
Adding the two last equations, we have, 
+ 474°-3F —173H = —117°37 [4] Do. 
From [1] and [4] we ae determine the respective values 
H, which are as follow 
F = 0°4730 H = 1'9765 
Or, stated in terms of CO,, by multiplying by 0°1943, 
F = 0°0919 H = 03833 per 1000 vols. 
Taking F as unity, we have, 
F: H::1:000: 41789 
of F and 
