1835.] Improvements in Science. 131 



burg have made experiments upon the solubility of this salt, 

 and have found that at 212° F, 100 parts of water dissolve 

 6*68 parts of the salt. 



100 parts water at 167° dissolve 4*55 

 „ 199° „ 2-64 

 75° „ 1-12 

 66° „ 0-49 

 The method of experiment was to allow a solution, satu- 

 rated at a high temperature, to cool down to the requisite 

 point, (Annalen der Pharmacie i. 7.) 

 To be continued. 



Article V. 



On a deposit of recent Marine Shells , at Dalmuir, 

 Dumbartonshire. By Thomas Thomson, Esq. 



The coal formation of the South of Scotland, which extends 

 from the firth of Forth to the firth of Clyde, is closed 

 towards the west by the Kilpatrick hills, an extensive 

 greenstone chain which terminates in the Clyde, by the 

 rock upon which Dunglass Castle, the termination of the 

 Roman wall, is built. On the south side of the Clyde the 

 coal field extends a little further, but there also it fs inter- 

 cepted by a range of greenstone and porphyry rocks, consti- 

 tuting the hills to the south of Greenock. To the west of 

 the Kilpatrick hills, on the north side of the river, we find 

 the beautiful white or reddish but non-fossiliferous sand- 

 stone of the neighbourhood of Dumbarton and Helensburgh, 

 and in the vicinity of the latter place there is also found a 

 vast quantity of red sandstone conglomerate, which there 

 rests immediately on the clay-slate. This is the same con- 

 glomerate which is found on the south side of the river 

 below Greenock, as well as in the island of Arran, and along 

 the coast of the county of Ayr, and at Campbeltown in the 

 Mull of Cantire. In all which places this conglomerate 

 occupies a stripe of land adjoining the seacoast, while 

 the interior of the country consists, about Greenock of 

 greenstone, about Helensburgh and in Arran of clay-slate, 

 and in Ayrshire of the coal beds. 



The rocks in the neighbourhood of Glasgow are in many 

 places covered with alluvial deposits, the nature of which 



k2 



