904 
W = 0.26914 543510 7 (Ag Piatt. a ee 
These deviations are certainly not large (at most rather more than 
0.1 degree); they are, however, appreciably larger than the inaccuracy 
of the measurements. They are on the whole larger as the impurity 
of the wire (ss estimated by the ratio 7) increases. This increase 
of the deviations with increasing impurity seems, however, not to 
be strong enough to warrant the conclusion, that for pure gold 
proportionality of the resistance with 7'* within the limits of the 
accuracy of the measurements would exist in the hydrogen region. 
This will find its expression in ZerRNikE’s more general interpolation 
formula in the fact, that in this range the coefficients of the polynomial 
in the denominator already make their influence felt. GRÜNRISEN’s 
relation W-C,7' brings this in connection with the deviation 
which the specifie heat of gold shows in this range from the 7’*-law’). 
In table I under JV—R,; we have also inserted the deviations 
between the observed temperatures and those calculated from the 
formula: . 
WV = 0.6879—0.01741 7 + 0.000865 7”. (Au) 27 ( 
Practically this formula represents the resistance of A1, accurately 
in this range, so that in the hydrogen range dW/d7 depends 
linearly ou 7. Outside this range the formula would lead, however, 
to quite incorrect values *). 
For the calculation of the results of the calorimetric determinations 
dealt with in this paper graphic interpolation was made use of. 
For the hydrogen range graphs of W and of 4 W/AT were made 
on a sufficiently large scale according to the observed values. For 
the higher temperatures 7’ and dIW/d7' were taken from graphs for 
the whole range of the calibration; for that purpose the W-curve 
was first drawn, from this values of dIW/d7' were taken for a 
1) 8"/, at 20° K. if for gold 6 = 166 is assumed according to. Desue. 
2) We have also investigated whether the resistances of Auc, and Aue, (of 
Which the first mentioned was enclosed in enamel, the second in paraffin) can be reduced 
to each other, either with the linear relation, which according to Nernst, or with 
the quadratic one, which according to Henning exists between the values of the 
resistances of those wires corresponding to the same temperature. We found, 
however, that in the range from 14° to 90° K. both relations give deviations of 
several tenths of a degree between calculation and observation. The same result 
as regards Neryst’s rule was found recently by H Scuimanx, Ann. d. Phys. (4) 
45 (1914), p. 706. As regards the exceptional difference between observation and 
calculation in the case of Aw -, which was found by this physicist, we refer to 
the erratum given in Suppl. NC. 19 (May 1908): in Comm. NO. 99¢ p. 22 table I 
column Awy, for 0.16822 is to be read 0.25234. 
