126 Mr. Bryce 07i the Geological Structure of Roseneath. 



No. m.— Spec. Grav. 2-88. 



By Mr. T. Carlile. By Mr. R. Kirkwood. 



SUica, 47-50 48-00 46-64 49-38 



Lime, 44-90 45-40 46-27 44-59 



Protos. of ironi i.ai 



andaluminaj ^'^O \l\ 1-44 1-49 



"Water, 0-80 0-80 0-80 1-60 



Magnesia, 0-70 083 1-05 



Soda, 0-92 -94 



Carbonic acid| 

 and loss, J 



4-85 -95 



99-30 99-57 100-00 100- 



No. IV. 



By Mr. R. Kirkwood. 



SUica, 49-380 In atoms this is 



Lime, 44-596 Silica, 24-89 1.93 



Alumina and protox.) i.^nn Lime, 12-74 1 



of iron, 3 And the formula is, omitting 



Soda, -936 the impurities — 



Magnesia 1-050 CaO,2SiO, 



Water, 1-600 or Bisilicate of Lime. 



99-052 



No V. 



Carbonate of Lime, 31-94 



Insoluble Siliceous Matter, 68-06 



100-00 



It appears from these analyses, 1. That the cornstones of Innerkip are 

 carbonates of lime, and not dolomites, as are those of Bute. 



2. That in this locality igneous action has converted a carbonate of 

 lime into a bisilicate. Now, as it appears from Analyses 1 and 2 that 

 there is but a trace of siliceous matter in the limestone, the origin of the 

 silica must be sought in the igneous rock ; in fact, a transference of a 

 portion of its silica must have taken place when the basalt was in a state 

 of fusion. Such transfer, indeed, could readily take place under the 

 influence of chemical attractions, when the rocks were in a state of even 

 imperfect fusion. See the Paper already referred to, in Art. 1, sub fnem. 

 On No. 4, or the Table spar. Dr. R. D. Thomson remarks: — 



" It is an interesting fact in connection with this mineral, that it gives 

 a yellow colour before the blowpipe when moistened with muriatic acid ; 



