Geological Society. 



393 



of the acid ; and still we have in jar No. 1 only 0-591 of sulphate of 

 baryta dissolved per 1000 grs. of acid, whilst we have 2-099iuNo.4jar. 

 But the relative bulk of acid is not the only influence which affects 

 the affinity of sulphuric acid for baryta, as the relative quantities of 

 nitrate of baryta and sulphate of potash put in presence also exert 

 an action. This fact is illustrated by the following results, taken 

 from three different tables, in which the same quantities of acid were 

 used, but different proportions of salts : — 



Table IV. E. 



This point is again brought out in the following table, which is 

 also taken from several series of experiments : — 



Table IV. A, 



These facts, and others described in the paper, demonstrate that 

 the solubility of the sulphate of baryta, or its non-formation, is not 

 only influenced by the respective bulks of an acid of spec. grav. ri67, 

 and the respective quality of salts employed, but that the relative 

 quantity of matter put in presence has a decided influence on che- 

 mical affinity ; and these observations not only corroborate perfectly 

 the results obtained by Mr. Bunsen on the influence of volumes on 

 the combination of gases, and the observations which show a like 

 influence on the carbonates, but also are, I believe, the first instance 

 which has been noticed of irregularity of solubility of a substance 

 in increased multiple bulks of a liquid. 



GEOLOGICAL SOCIETY. 



[Continued from p. 315.] 



March 19, 1856.— D. Sharpe, Esq., President, in the Chair. 



The following communications were read : — 



1. "On some Organic Remains from the Bone Bed at the base 

 of the Lias at Lyme Regis." By the Rev. Mr. Dennis. Communi- 

 cated by Sir C. Lyell, V.P.G.S. 



In this communication the author drew attention to some peculiar 

 Phil. Mag. S. 4. Vol. 11. No. 73. May 185G. 2 D 



