1385 
TABLE I. 
Change of the resistance of pyrite with the 
temperature. Measurements in Upsala 1911. 
We oe 
Î W Al obs. lw zl calc. 
+ 100°.9 C. 1.422 1.436 
+ 54 .2 1.223 1215 
+ 44.5 ee ee eK) EU 
0 | 1 
— 78 .6 0,726 0,754 
— 193 0,508 0:495 | 
TABLE II. | 
Change of the resistance of pyrite with the 
temperature. Measurements in Leiden, 1912. 
Ww We 
dl liv al obs. | W | calc. 
==, Aa or DE 1.063 1.058 
— 183 0.519 0.520 
— 252.8 0.405 0.404 
— 258 0.390 0.396 
W 
given and in Table Il these last results of 1912. The values lz 
cal 
0 
are calculated from the formula (1), where now 
B Ko 10% 
The results are well represented by this formula. The values of 
at low temperatures that were found in the last observations 
0 
are in better agreement with the formula than the earlier ones. 
The results for t=— 78°.6 C. and — 193°C. in these deviate a 
little from the calculated values, but in different directions, The 
