Magnetism, Cohesion^ Adhesion and Viscosity. 509 



these unexpected results will be seen at a glance by referring 

 to the list. 



Antimony and bismuth stand high with such non-ferruginous 

 metals as have been tried ; platinum, for which the attraction 

 of both is low, being excepted. With cadmium the attraction 

 for antimony was raised to 90° by keeping the latter in con- 

 tact with a bai'-magnet for a short time ; yet tin, between which 

 and cadmium there is such a similarity, attained 90° without 

 being kept in contact with the bar-magnet; but I see by a 

 reference to the note taken at the time, that it was accom- 

 plished with some difficulty. It is remarkable that antimony 

 was twice raised with the brass needle to 90° with great ease, 

 though before it could not be got higher than 30°. In the 

 same way antimony was last year made to connect itself at 90" 

 with the copper needle, while now the cut end could only be 

 got up to 40°, and the side to 55°, but this sort of capricious- 

 ness has occurred from time to time without any assignable 

 cause. 



2nd Class. 



Selenium with M 10°; I 75°; P. G. 90°+; G. 18c. 30°; 



P 20°; PI. 39°; Cad. 90°+; T 90°+; L 35°; Z 90°; 



Cop. failed ; B 63° ; Ars. failed ; Gl. 90°, f. 

 Sulphur with M 28°; I 39°: P. G. 90° + ; P 20°; PI. 65°; 



Cad. 90°; T 90° ; L 90° x ; Z90° + ; Cop. 90° + j B65°; 



Gl. 90° f. 



What has already been said with regard to sulphur and 

 selenium in the first part of this paper, leaves but little to be 

 added. They will be found to show only a remarkable 

 affinity for glass, but their contrast with lead is striking. The 

 energy of both was heightened by being kept in contact with 

 a magnet, and then tested with a brass needle. The preference 

 that selenium shows for iron over the magnetic needle, is 

 worthy of attention, as well as the contrast it stands in with 

 sulphur, in its low attraction for lead. 



Srd Class. 



Diamond with M 65°; I 90°, not very difficult; G 18c. 90° j 

 PI. 90°, f. strong; Cad. 90°, not easy; T 90°+; Z 90°; 

 Cop. 90°, f. easy; B 90° + ; Gl. 90°, f. 



Ruby with M 90' + ; Cad. 90° + ; T 90° + . 



Sapphire with M 90° + ; Cad. 90° + ; T 90° + . 



Topaz with M 71-° ; Cad. 75° ; T 68°. 



Topaz (pale) with M 66°; Cad. 83°; T 80°. 



Jargoon with M 90° + ; Cad. 90° + ; T 90'+. 



Emerald with M 90° + ; Cad. 90° + . 



