a lo Centigrade! | | 
| Bath scale in Kel, Migr = @vap.r Dor obs. Drcatc. obs.—calc. | 
vin degrees | | 
alee | bei | 
O, | — 208.36 | 0.8622 0.00089 0.4316 | 0.4308 | + 0.0008 
O, | — 205.45 0.8499 | 0.00136 | 0.4256 | 0.4251 |+ 5 | 
O2 | — 200.03 | 0.8265 | 0.00218 | 0.4146 | 0.4145 | + 1 | 
0, | — 195.09 | 0.8043 | 0.00490 | 0.4046 | 0.4048 He 2 | 
O, | — 182.51 | 0.7433 0.01558 0.3794 | 0.3802 |) eel 
CH, | — 173.73 | 0.6922 | 0.02962 | 0.3609 | 0.3630 | — 21 | 
CH, — 161.20 0.6071 | 0.06987 0.3385 0.3385 0 
CH, | — 153.65 | 0.5332 | 0.1177 \ 0.3255 | 0.3237 | + 18 | 
CoH, | — 149.75 | 0.4799 | 0.1638 0.3219 0.3161 bale 58 | 
CH, | — 148.61 | 0.4504 | 0.1862 | 0.3183 | 0.3138 ee 45 | 
CoH; —- 148.08 | 0.4314 0.2000 | 0.3157 | 0.3128 + 29 | 
In the table og is the density and D the ordinate of the diameter ; 
liq. and vap. refer to the liquid and the saturated vapour, and the 
index T indicates that the density is given in grammes per cc). *) 
The ordinates of the diameter are calculated from the formula: 
Dor = 9.022904 — 0.0019577 6. 
The coefficients in this formula were calculated by the method of 
least squares from all the observations with the exception of those 
at — 149°.75, — 148°.61 and —1448°.08. The reason, why these 
three observations were not used in the calculation of the coefficients, 
will appear later on. 
§ 6. Discussion. As appears from the table and even more plainly 
from figure 2 the deviations from the calculated rectilinear diameter *) 
are (1) systematic (2) near the critical point fairly considerable. It 
would be possible to distribute the deviations more evenly over the 
entire diameter by taking up the three observations which we have 
just referred to in the calculation of the coefficients; we have, 
however, preferred the method of calculation as given above, because 
1) For the notations see also H. KAMERLINGH ONNES and W. H. Kersom, Enc. 
math. W-cs. V. 10. Comm. Suppl. N°. 23. 
2) In a preliminary note ‘“Eléments critiques et phases coéxistantes des gaz 
permanents’ (Arch. d. Sz. phys. et nat. Genève, 15 Aug. 1914, pg. 187) without 
numerical data E. Garposo mentions, that the diameters of oxygen and nitrogen 
are rectilinear up to the critical point. 
