968 
with a series of different numbers of molecules of water of crystal- 
lization, and from that to deduce a possible dependence of 4’ upon 
the density. 
§ 12. Platinum. A small cylinder of pure platinum from Hermus was 
examined. ‘lhe susceptibility changes very little with the temperature. 
On account of its small value it is difficult to determine x accurately. 
The results are contained in Table IX. 
TABLE IX. 
Platinum 1. | 
‚Limit value, 
Tr 7.106 eld | 
| in Kilogauss. 
| 
200.2 K 0.973. 1, 
17.4 1.061 | 
| 11—17 
20.1 14.080 | 
lane a ORT ed | 
| | 
The value at ordinary temperature lies about the middle of those 
of Owen, 0.80 resp. 0.89, Honpa 1.097, KOENIGSBERGER 1.35, FINKE 
1.06 (all at 18° C.). If one wished to go so far with the application 
of the rule C’ =y (T+ A’) that one applied it to platinum also, 
then it would follow from this that A’ = 2440°, and for the number 
of magnetons n calculated from C” the value n= 10. 
§ 13. Dysprosium oride Referring to the data of $ 7, we observe 
that, as will also appear from a further communication of KAMER- 
LINGE Onnes and Perrier, all the values of 4 which occur there 
must be increased in the ratio of 1: 1.065. By applying this correction 
also the difference from the value at ordinary temperature found by 
Mile Frytis which was stated upon in §2 ofComm. N°. 1224 and which 
was due to an error of calculation, is reduced to a divergence within the 
limits of accuracy; hence the dysprosium oxide appears to have been 
about in the same condition as the sample used by her. Our conclusions 
undergo no change by the correction. 
influence of the successive molecules of water of crystallization upon x. This might 
be the consequence of a change in Q’ with an unchanged number of magnetons. 
