454 Sir G. C. Haughton on the Cotnmon Nature of 



liemot of this city (Paris), who considered them as such ; 

 but the tin and lead were taken from the ordinary specimens 

 of commerce, and if the supposition which accounted for the 

 magnetism of non-ferruginous bodies by their containing minute 

 portions of iron, had any foundation, it would have been 

 apparent in these two substances; yet it will be seen that the 

 magnetism of both shows nothing very remarkable, and that 

 the tin exhibits the same degree of attraction as the specimen 

 of cadmium which I believe to be chemically pure, and these 

 two will be found, nearly in all circumstances, to exhibit as 

 remarkable a conformity magnetically as they are known to 

 do chemically. When I show, however, the mutual attrac- 

 tions of non-ferruginous bodies, it will be seen that the notion 

 of Coulomb, and other experimenters posterior to him, cannot 

 be accepted as accounting for the results they observed. 



2}id Class. 

 Selenium 10° | Sulphur 28° 



Selenium and sulphur both exhibit very low intensities with 

 the magnetic needle, and even these are obtained with so 

 much difficulty as to demonstrate that they are forced states. 

 I have paid particular attention to these tvvo singular sub- 

 stances, and have found that they resemble one another as 

 much by their magnetic properties as by those that are che- 

 mical. I will here anticipate the branch of this inquiry which 

 is to follow, by stating that they are remarkable in nearly 

 agreeing in their affinities for the metals, but particularly for 

 gold. They, however, show not the slightest attraction for 

 one another, and therefore must be considered as mutually 

 repulsive. I have invariably found that where there is a che- 

 mical I'esemblance there is likewise similarity in magnetic 

 properties, and these two substances maintain their resem- 

 blance in the same way as tin and cadmium, which only 

 exhibit a difference of nature with respect to arsenic; but 

 everything regarding this last body seems anomalous, which, 

 like sulphur, has no affinity for selenium. Contact with the 

 magnet appears to elevate their power of attraction, at least 

 this was the case, as will be seen hereafter, when they were 

 tested with brass. 



3rd Class. 



Diamond 65 



Do. (2nd specimen) 65 



Ruby 90+ 



Sapphire 90+ 



Topaz 74 



Do. (pale) 66 



Jargoon 90+ 



Emerald 90+ 



Oiu-al emerald 32 



Garnet 



Tourmaline 32 



Amethyst 65 



Turquoise 47 



Opal 



Mexican opal. 

 Moon-stone. 



Agate. 



Cornelian (red) 35 



Do. (white) 37 



Blood-stone 37 



Quartz 90 



Flint 90 



