Atomic Volume and Specific Gravilj/. 469 



the solid volume have any relation to that occupied by ice,, 

 we have determined the specific gravity of" the latter with great] 

 care. The distilled water, which we converted into ice, was 

 deprived of air by long-continued boiling, and a weighed por- 

 tion of the ice was quickly immersed in water at 32 , the ba-* 

 lance being kept at the same temperature during the weighing 

 of the ice. The rise in the stem of the volumenometer, in which 

 fragments of ice had previously been placed, indicated the 

 volume due to the quantity of ice immersed. On treating in 

 this manner 54<"2 grains of ice, a rise in the stem of 59 was 

 produced ; and in a second experiment 52*8 grains of ice oc- 

 casioned an increase of 57*5, the temperature in both cases 

 being exactly 32°. 



'■■ ' '- Specific volume. Specific gravity. 

 I. J'Oe volume 9-797 ... 0-9186 



Mean ,q;,,^ o'^"?8%-GS"bni> 0'mS4> oe^Qtoai he 

 As the true specific gravity of ice is a subject of much im- 

 portance, we place here all the recorded results, as given in 

 Bottger's most useful work on specific gravity, and in the first 

 volume of Scoresby's Arctic Regions, 

 "'^f Specific gravity of icie ' 0-888 Dulk. '^, ^^^'^f^ 



... f . ... -. 0-937 Irvme.' . ,, „. ooo * 

 fiB 97fis jja3f«7iu|vs^^nfi t^ 0.9^5 Willian^i's^r^ f f ^ ' ^^ ^^ 



: 0-885 Meineke. ■' ^'^^^«^*'^™ 



0-905 Heinrich Krkh. 

 . ..■■'•': ... 0-927 Osann. 



...*■' ... 0*950 Roger and Duilnas. 



...;•: ... 0-920 Scoresby. 



Ylanof" i-rq Mean . . 0-919 - H!v>i«d io ?.nht^ 008 



The mean of all these experiments, differing oiity-flj^^^ 

 from our own determination, warrants us in concluding that 

 our result is accurate, and that 9*80 may safely be taken as 

 the specific volume of an atom of ice. Now it must at once 

 strike the observer of the previous experiments, that this num- 

 ber forms the divisor for the volumes of the salts described in 

 the present section. ov (.ingua-onxjJ 



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