350 Mr. J. J. Waterston on Liquid Expansion. 



stant value 504. Also the points in c c should range in M M. 

 They do so approximately, it will be remarked, in the upper part ; 

 and this perhaps is the cause of the mistaken induction, as it was 

 the upper part that was chiefly relied upon in my sealed-tube 

 observations. 



The following are M. Drion's observations from which the 

 muriatic ether points were computed (Ann. de Chim. vol. lvi. 

 p. 21) :- 





Tempera- 



Volume. 





Tempera- 



Volume. 





ture. 







ture. 





No. 1 



o 







1-0000 



No. 8 



o 



83 



1-1647 



2 



12-6 



1-0195 



9 



93-5 



1-1946 



3 



26-4 



1-0428 



10 



103 



1-2248 



4 



35-0 



1-0586 | 



11 



112 



1-2567 



5 



45-5 



1-0787 ! 



12 



120-5 



1-2908 



6 



59-0 



1-1067 1 



13 



128 



1-3249 



7 



71'5 



11354 



14 



133 



1-3507 



The differentials are computed from the couples 1 and 4, 

 2 and 5, 3 and 6, &c. ; e. g. for the first couple eft = 35°, 



<fo = -0586, and t, the middle temperature, is 17°'5 ; so — = 597, 



which is the ordinate to 17'5 for the first point in the line dd. 

 The corresponding first point in the line c c is obtained by mul- 

 tiplying the last, viz. 597, by 1*029, the mean volume between 



vdt 

 Nos. 1 and 4. This gives -j- =615 as the ordinate to be laid 



off to 17'5, the mean temperature as before. The following 

 Table is thus computed : — 



Muriatic Ether. 



Couples. 



t. 



dv' 



vdt f 

 dv' 



1 & 4 



o 



175 



597 



615 



2 „ 5 



29 



559 



587 



3 „ 6 



42-7 



509 



545 



4 „ 7 



53-3 



474 



520 



5 „ 8 



64-2 



436 



488 



6 „ 9 



76-2 



392 



450 



7 „ 10 



87-2 



350 



413 



8 „ 11 



97-5 



315 



381 



9 „ 12 



1070 



281 



348 



10 „ 13 



115-5 



250 



319 



11 » 14 



122-5 



223 



290 



The following are M. Drion's observations from which the 



