0-0611 



0-1722 

 0-1686 



Indium, 



37-8 



ation of this material witli barium 

 L of chlorine gas, and which gives by melt- 

 ing with potassic hydrate a copious yield of potassic ruthenate. 

 The oxide thrown down from this salt by fractional precipita- 

 tion with carbonic acid was converted into chloride with hydro- 

 chloric acid, the aqueous solution of this latter salt was precipi- 

 tated with hydrogen gas, and the metal, in the state of lustrous 



hydrogen to remove eve 



.-'Mi 



tni It' of oxide. It proved on examination to be entirely free 

 i!'<nii the other platinum metals. The specific heat found there- 

 ior accords, as might be expected, with the previously accepted 

 atomic weight. 



The calcium was reduced by electrolysis from melted calcium 

 chloride. It formed small pale golden-yellow globules with a 

 Qigh metaUic luster, which take in the air, very rapidly, a gray- 

 ish tarnish. Before enclosing in the glass envelope, they were 

 shaved bright in an atmosphere of carbonic acid. Upon exam- 

 jnation, it proved to be almost entirely pure. From the atomic 

 neat thus found, it may be concluded that the previously accept- 

 ed atomic weight C«=20 is the correct one, and need not, as 

 lias become necessary with the atomic weights of the alkali 

 metals, be halved. 

 «-' nder allotropic tin is understood the singular modification 

 ^liis metal, which appears to form from ordinary tin by long 

 "■'1 very low temperature. The specimen investigated 

 "in the large mass, altered by the cold of an unusually 

 1 severe wanter, on which Fritzsche had observed this 

 ■'le allotropy, first described by him. The mass con- 

 ' an aggregate of small undeterminate angular rods 

 ■"herent in one direction, which crumbled by even 

 ■-•■■^sure. This tin possesses, as I have convinced myself, 

 "gree of purity, ' ' ' "^ "'^' "" "" 



. . ^ -—3 metalliv. ou.xpiiivAa. -.^.. ^.^. 



|onsists are not brittle but ductile like ordinary tm. The n 

 '^otropic metal investigated was obtained by re-melting the 



