( 21 ) 
38.12 1558 
Pressure in atm. = xX const. means. 
( 
97.38 1565 | 
96.68 1560 1559 
96.13 108 | 
73.04 Fat | 
12.82 1548 | Pao 
zeen, 1545 | 
49.33 Lp, | 
base 
49.15 Poon 
38.47 1546 
38.44 1545 | 1550 
1 
All measurements are made at a wave-length of 0.608 «. 
The means can be esteemed equal, because the differences 
lie within the errors of observation '), and we find our supposition 
confirmed for pressures ranging from 100 to 38 atm. If at 1 atm. 
variations of 10°/, would appear, we could expect them to be per- 
ceptible at least at 38 atm. This not being the case, we shall have 
to look elsewhere for the cause of the difference between BucQUEREL’s 
results and mine. 
With N.O and with CO, the differences *) alluded to are much 
greater and it might be possible that with these gases, which 
diverge more from an ideal gas than oxygen, deviations from the 
proportionality in question would be perceptible. 
Therefore I intend to make the same measurements on the mag- 
netic rotation of one of these gases also. 
sieke pe 34E 
Sh ep 919. 
(June 20th, 1899.) 
