Mr. Napieu on Sandstones used for Building. 



Silica, 654 



Clay, 8-5 



Lime, 19-8 



Protoxide iron, 1-2 



Magnesia, trace. 



Water, 32 



317 



98-1 



From the fineness of the grain of this stone, the washing out the clay is 

 not so perfect, but washed as carefully as I could, to see if lime was 

 washed ofij the results were — 



The washed portion left 

 on filter. 



Insoluble, 88-8 



Oxide iron "S 



Lime, lOO 



Clay portion passing 

 "through filter. 



Insoluble, 50" 



Oxide iron, TG 



Lime, 48' 



99-6 



99-6 



I will now give the chemical character of the sandstone from the prin- 

 cipal quarries in the neighbourhood of Glasgow, premising, that although 

 I have made several analyses of stones from every quarry, their sameness 

 renders it unnecessary to give every result, and will therefore only give 

 the average of each kind or quality, with the uses for which each stone 

 is more especially applied, and there being few remarks required on 

 individual analyses, I will subjoin them in a tabular form. I must 

 remark that in these analyses the clay was separated in the manner 

 stated above, the only chemical testing was for lime, iron, magnesia, 

 and sulphur. Many stones contain seams and thread-like fibres of carbon- 

 aceous matters, which were avoided in the testing in the following table : — 



