20 
DE. A. MATTHIESSEN AND M. VON BOSE ON THE INELTJENCE OF 
Table XII. 
Length ...= 269 milliras. 
Diameter =1*424 millim. 
The means of the conducting powers found for each of the following temperatures 
were — 
T. 
Conducting power. 
Difference. 
T. 
Conducting power. 
Difference. 
Observed. 
Calculated. 
Observed. 
Calculated. 
O 
0 
20*55 
40*45 
59-82 
79*78 
99*90 
1*6521 
1*6276 
1*6003 
1*5750 
1*5465 
1*5162 
1*6530 
1*6272 
1*6011 
1*5746 
1*5462 
1*5164 
—0*0009 
+ 0*0004 
-0*0008 
+ 0*0004 
+ 0*0003 
— 0*0002 
o 
0 
20*95 
39*92 
60*40 
80*70 
99-30 
1*6529 
1*6272 
1*6010 
1*5741 
1*5454 
1*5174 
1*6533 
1*6268 
1*6018 
1*5738 
1*5450 
1*5177 
—0*0004 
+ 0*0004 
— 0*0008 
+ 0*0003 
+ 0*0004 
— 0*0003 
The formulte deduced from the observations, by which the conducting powers were 
calculated, were — 
For the first series . X=1’6530 — 0’0012240^ — 0•000001434^^ 
For the second series X=1’6533 — 0'0012370^ — 0’000001297^^. 
The value found for the conducting power of mercury was 
o Eeduced to 0°. 
1-63 at 22-8 1-6588 
Taking the mean of the values as before, we find the formula for mercury to be 
X = l-656-0-0012326^~0-000001368f. 
Tellurium. 
Purified by dissolving the commercial metal in aqua regia, evaporating to dryness -with 
excess of carbonate of sodium, fusing the residue, which was dissolved in water, and 
nitrate of barium added to precipitate any selenium present. The filtrate was evaporated 
to dryness with hydrochloric acid in excess, the residue dissolved in water, and precipi- 
tated by sulphurous acid. 
On account of the low conducting power of tellurium, small bars of about 15 mil- 
lims. in length and 3-5 millims. in diameter were used for the experiments. Bars I. 
and II. are of the same preparation. As the bars could not be accurately measured, we 
have called the first observed conducting power 100 in each case. Table XIII. gives 
the results. 
