323 
| TABLE | | 
Anhydrous ferrous-sulphate I. | 
Te | x. 10° | x.T.10° Limits of H | Bath 
290°.2 K | 67.6 19617 14000 ~ 16000 Room atmosphere 
169,6 | 1072 | 18181 14000-17000 | Liquid ethylene 
dS 200.4 | 15491 | | 
10.4 | 215.1 15143 ‚{ 14000—17000 Liquid nitrogen 
EEN EE | 
20.1 402 | s080 | | | 
| 17.8 | 379 6746 ‚_ 10000—16000 | Liquid hydrogen 
nt ta 5 | 484 | | | | 
very large extent at hydrogen temperatures. For while the increase 
in the value of x brought about by more efficient drying is only a 
few percent at ordinary temperature, it is as much as 50°/, at 20° K. 
That we must really look in this direction for an explanation of the 
TABLE, Il 
Ferrous sulphate III. not quite anhydrous 
as ial A 
7 ex. 108 Limits of H | Bath 
| 
| 
289°.5 K | 621 \ 8000—17000 | Room atmosphere 
169 .6 95.7 | 9000—17000 | Liquid ethylene 
Tes. 169.8 | 
70 .4 182.0 500015000 | Liquid nitrogen 
64.8 | 1898 | 
20 1 231.4 | | 
fie 6. kern | 400017000 | Liquid hydrogen 
pie, cutesy | | 
differences between the numbers given in November 1911 and those 
now communicated is evident from an experiment in which the 
quantity of moisture present in the ferrous-sulphate was purposely 
increased slightly (the quantity of water present being probably a 
little greater than that of ferrous-sulphate I, by which we designate 
