478 Fjfederiok Guthrie on Euttxia, 



load dissolved is, however, small, and fclm fusinc/~poinf, is only 

 lowered about .'>"., standing QOWatabout !>l. r ) n . A(. Ion 1 1 >e injures 



above Its melting point, «< would be us^ustifiabl^ lo '-.'ill sueh 

 :\ liquid .in alloy, because Its composition, in all probability, 



depends Upon its temperature in as far as that composition is 

 referred to lh<' < 1 1. 1 1 i I >u ( i< »i i of adds and banns. As il cools ii. 



8 Ives up sulphate of iead in little onrstals which sink. At 

 ie temperature of mom) solidification begins, and is 



completed ■ 



Of this alloy 4*2725 gram* worn treated with water and a 

 little alcohol) and the insoluble sulphate of lend was found to 

 weigh 0*1968 gram, corresponding to 4*63 per oent. 



Sulphate of lead requires for fusion per .<■ a bright rod, 

 almost white beai But itis thus Pound to dissolve in hot 

 Rised nitre, and it separates as suoh on ooolina the fused 

 liquid, For the geological value of this faet sec ^ 230. 



!6, Sulphate of Calcium behaves in q similar manner, 

 Highly refractorj by itselfi it dissolves in fused nitro. Tim 

 cooling mixture, after shedding the excess of sulphate above 

 that required for the eutectic alloy, solidifies at a constant 

 temperature of aboul \\\W\ The lime, separated as oxalate 

 and weighed as carbonate, showed q percentage of sulphate 

 of 0*98. For 8*4882 grams of alloy gave 0-02'W gram of 

 oarbonate, or 0*08287 gram of sulphatei 



17, Nitre and Sulphate of Barium* Even the sulphate 

 of barium, winch is fcypioai of aqueous Insolubility, dissolves in 

 fused nitre, depresi ing the solidify ing point, however, almost 



Inappreciably. A Utile separates on cooling, and 8*5-1 ;;r;inis 



of the eutectic alloy, when boiled with water, gave (H)fl 

 gram of the Insoluble sulphate, or ()'!hs |„. r eent. Ii may be 

 noticed In passing that, as is well known to analysts, sulphate 



of*harium is soluble lo an appreciable extent in another fused 



nitrate, namely nit rate of h\ drogen. 



18, Specific Gravity of the Eutectic Allot/ of Aitmtr of 

 l ' •.////// and Nitrate <y Sodium, 



Blabs of nitre, nitrate of sodium, and the euteotic alloy o\' 

 the two were oast npon s surface of oold metal, the liquids 

 themselves being when poured only a lew decrees above 

 their melting points. Their specific gravities were found by 



Weighing them in oil ol turpentine of ascertained spooiiio 



imIv. I found the 



Bpeoiflc gw itj of nitre 2*2028 



„ „ nitrate of sodium 2*0469 



)} ,, the euteetie alloy LM.'^JS 



If the two woro to mix without either gain or loss of volume 



