( 430 ) 



acconling to the above tal)le il u\\\\ yields Iruslwortliy values for T 

 up (o al)()ut 90^. At 90' ,t' == 0,8, aiul then, according to (7), we Ikave: 



7 = 7., [1 4-(«..-^ + /?.6-^ + y.f'], 

 or q = q, [ 1 4- 0.825 ,/:•■' — 1.11 .r''' -f 1.38 x% 



that is to say q = 1.185 </„ -= 3020 graiu-cals., 

 whilst VAN Hetkren (at 25") found + oOOO gram cals, by means of 

 electromutive measurements ^). The concoi'dance is absolute. 



We, linally, wish to remark, that according to the determinations 

 of VAN IIktkkkn and of Hkycock and jS'evii,i,k, regarding I lie lowering 

 of the lem[)erature of fusion of tin oji adding small (luantities of 

 mercury, y„ niKst be =: 2550 cals. We iherefoi'e see, that the value, 

 assigned by Person, namely 14.25 X ii8.5 = 1690 gram cals., is much 

 too small. In a later communication 1 ^vill show, that the heat of fusion 

 of mercury, given by Person, is also many times too small. 



Dec. 1902. 



1) Dissertation pg. 49. 



