999 
tes, for magnetite, metallic titanium and metallic zirconium, a phe- 
nomenon explained by J. Kounigspercur by the dissociation of elec- 
trons from the atoms. 
03 2 : mr BE 
With this plate, too, an increase of the resistance was observed 
on returning to ordinary temperature 7’— 290° K after having cooled 
it to hydrogen temperatures. In this case, however, it was much 
smaller than with Zer, and was, at the most, 5°/,. We obtained 
the following results: 
TABLE XXVII. 
Harreffect for 7e I 
ij | 
HeT 2012 K | 7 = 802K | T=20.°3K || T=14.°%5K | 
in | NET ut H = EE " : =) desk ae 
gauss RH Reel, RH Ren Il ARR oee Deen 
| 3720 || 6.90x105! 185.5 || 1.85X105! 210.5 | 7.98x105| 214.5 || 7.85x105) 211 
peso’) 10.55 | 186 || 11.95 | 210 || 12.1 213 eee vanes 
Ere CN | — |) 15.4 {212 [15.0 | 206.5 
9065 | 16.75 185 || 18.75 | 207 19.05 | 210 || 18.68. | 205.5) 
10270 || 18.85 | 183.5 | 21.25 207 21.4 208.5 || 21.0 204.5 
| | 
tl | 
At any definite temperature / is practically constant for various 
fields; at lower temperatures there is an indication that / diminishes 
somewhat in the stronger fields; this is most marked at hydro- 
65” 
