14 
.'•DE. A.'IIATTHIESSEN VON BOSE ON' THEJNELUENjCE £)F-1* 
j Tlie farmulse deduced from the ohseiTations,' From which fhe conducting powers were ; 
■ calculated, were — • • _ 
\ ^ I 
I _ iFor first wire . X=24-100 — 0‘088554^+0'0001740^2. i 
( 1 For second wire . X=24‘240— 0-’0967§3#4'0‘h002548if^. 
j ^ - > For third wire . X=24-974~0-078004i+0-0001147z^. ^ 
: The values obtained for the alteration in the conducting power of these wires after 
^ Jreating them for several days to .100°^ have unfortunately been lost. It-may, however, — 
be stated that the difierences were very small, and that there was a loss in conducting 
power. — : , ' ' : 
The conducting power of cadmium was found in the paper already referred to — 
o Eeduced to 0°. 
22-10 at 18-8 ' 23-678. - 
Deducing the formula for cadmium in the manner before described, we find, - - 
X=23-725-0-087476^H-0-0001797f. ; : : 
Pure cadmium, when heated to about 80°, becomes exceedingly brittle, in fact it may 
be powdered in a hot mortar with great ease. We should not have been able to carry 
out the determinations if the wires had not been varnished, as the movement of the oil 
by the stirrer would have caused them to fall to pieces. It is worthy of remark that 
this change m the molecular arrangement of the wires does not make itself apparent in 
the conducting power to any very marked extent. 
- Tin? 
Pimfied by dissohing commercial tin in nitric acid, and reducing the washed oxide 
by heating it with lampblack. Pressed wires were used. Table VII. gives the results^. 
Table VII. 
First wire. 
Second wire. 
Third wire. 
Length 
279 millims. 
375 millims. 
315 millims. 
Diameter 
0’559 millim. 
0-634 millim. 
0-729 millim. 
Conducting power 
found before heat- 
■ ing the wires 
Ditto, after being 
kept at 100° for 1 
dav 
o Eeduced to 0° 
10- 970 at 18-2 11-710 
11- 124 at 19-4 11-926 
10-852 at 27-0 11-956 
10-835 at 28-0 11*980 
o Eeduced to 0°. 
11-532 at 18-1 12-324 
11-442 at 19*1 12*273 
11-448 at 18-6 12-257 
11-444 at 18-4 12-264 
„ Eeduced to 0°. 
12-285 at 18*2 IS’^l.CTt ' 
12-291 at 18-4 13-124 .. 
12-296 at 18-4 13-129 
• 
Ditto, for 2 days ... 
Ditto, for 3 days... 
The means of the conducting powers found for each of the following temperatures 
were — • , ' ■ ^ 
