1876.] 



Specific Volumes of Liquids. 



291 



The second series of observations may with equal accuracy be repre- 

 sented by the expression 



V=l+0-001324 75* + 0-000 003 001 54 * 3 



+ 0-000 000 000 405 511 1\ . . . (II.) 

 The mean formula is 



V=l + 0-001330 946* + 0*000 002 809 78 1 2 



+ 0-000 000 002 156 57**, . . (III.) 

 by the aid of which the following Table, showing the true volumes of 

 silicon tetrachloride for every 5° between 0° and 60°, has been cal- 

 culated :— 



°c. 



Volume. 



Diff. 



°c. 



Volume. 



Diff. 







100000 





40 



105787 



775 



5 



100673 



673 



45 



106578 



791 



10 



101359 



686 



50 



107384 



806 



15 



102060 



701 



55 



108206 



822 



20 



102776 



716 



60 



109044 



838 



25 



103506 



730 









3a 



104252 



746 



57-57 



1-086346 





35 



105012 



760 









The specific gravity at the boiling-point is 1-40295, and the specific 



, 169-94* 191 . iq 



Y0lume== r4O295 =12118 * 



Pierre has given the following expression for the expansion of this 

 liquid f:— 



Y=l + 0-001 294 119 069*+-000 002 184 143 631 * 2 



+ •000 000 040 864 220 * 3 . 



This formula represents a curve slightly differing in character from 

 that afforded by my observations, as is evident from the following com- 

 parison. The temperature in this and the following comparisons is 

 given in degrees of the mercurial thermometer. 



10° 20° 30° 40° 50° 



Pierre .... 1-01320 1-02708 1-04189 1-05804 1-07527 

 Thorpe .... 1-01349 1-02757 1-04226 1-05756 1-07352 



The specific volume of silicon tetrachloride, calculated from Pierre's 

 results, is 1-^9502 = 



IV. Titanium Tetrachloride. 

 I am indebted to Mr. Phillips Bedson, B.Sc, of Owens College, for a 

 liberal supply of a pure specimen of this liquid. On distillation it com- 

 menced to boil at 135°-8; the column rapidly rose to 135°-9, at which 

 * Si =28-10, Dumas; 01=35'46, Stas. t Loc. cit. ■ 



