32 Drs. A. Matthiessen and C. Vogt on the Influence of 



observed ,JI (II. a) .... " In fact, had we determined the conduct- 

 ing power of the melted alloys, we should have obtained similar 

 curves to those found for the conducting power of the alloys in 

 a solid state" (II. b). Now, according to the above hypothesis, 

 we ought not to have found a decrement in the conducting power 

 of bismuth on adding traces of lead or tin to it in a liquid state, 

 but an increment ; for both lead and tin have a higher conduct- 

 ing power than bismuth, even in a liquid state, according to the 

 values deduced from our experiments by Mr. Sabine. 



Again, if we take the mean of the values deduced for the con- 

 ducting powers of gold and silver, we find for gold 113, and for 

 silver 66'0. Now, when we calculate the conducting power of 

 the gold- silver alloy from these values, we find it equal 90*5 at 

 ]3°, the true value being 99' 1 at 13° (III.). The calculated 

 value is much too low ; but it must be remembered that we have 

 assumed, in order to deduce these values, that the conducting 

 power of mercury in its amalgams remains unaltered, which 

 seems, however, to be exceedingly doubtful. Then, again, if we 

 look at the curves which express the conducting powers of 

 alloys* in a solid state, we find that a great many alloys of lead 

 and silver have nearly the same conducting power. There are 

 also a great many tin- silver alloys whose conducting powers 

 differ very little from each other. Now, if we take the mean 

 values deduced from our experiments, and assume that the con- 

 ducting powers of the components take part in that of the alloy 

 in the ratio of their relative volumes, we arrive at numbers which 

 really agree approximately with those found by experiment (IV.). 

 In Table II. we give these numbers, and, for the sake of compari- 

 son, those calculated in the same manner, using the conducting 

 powers of the metals in their solid state. 



Table II. 



Lead-silver alloys. 



Tin- silver alloys. 



o 

 < 



O 



S3 

 3 

 u 



^CD 



•fl ^H 



a 



r— \ 

 O 



IF* 



to 



.5 



a 



a & 



rt 

 U 



Calculated con- 

 ducting power. 



o 



O 



c 



CD 

 U 



u 



cu • 



p., a 



CD 



a 



fl 

 > 



fl 

 o 



rr-J *H 



fl % 



§ 



CD 



Calculated con- 

 ducting power. 



CO o 

 ^-. to 



co to 



II II 



T3 CD 

 rt > 

 v ."fl 



td OS 



cn in 



lO to 



CO 



II II 



, u 



T3 CD 



ci > 



qj *— < 



H CZ) 



>o © 



in to 

 t^co 



11 II 



u 



CD 



E-i'on 



in w 



co m 



co 



II II 



u 



S3 



Pb 80 Ag 



Pb 20 Ag 

 Pb* Ag 

 Pb 4 Ag 

 Pb Ag 

 Pb Ag 



9779 

 94-64 

 87-60 

 7790 

 63-86 

 46-90 



52-6 

 53-6 

 56-5 



59-7 

 710 



77-8 



61-4 

 61-6 

 61-9 

 62-3 

 630 

 64-8 



65-4 



83-6 



124-6 



180-7 

 262-5 

 361-0 



Sn 180 Ag 

 Sn so Ag 

 Sn 36 Ag 

 Sn 2i Ag 

 Sn 18 Ag 

 Sn 12 Ag 



99-28 

 97-47 

 9652 

 94-87 

 93-28 

 90-25 



75-6 

 76-2 

 76-2 

 770 

 76-9 

 767 



754 

 75-3 

 752 



75 

 74-9 

 74-6 



82-5 



92-5 



97-8 



1070 



115-8 



132-6 



Phil. Trans. 1860, p. 161. 



