NOTES ON HYDRAULIC LIME AND CEMENT. — MASON. 1S5 



identical with that submitted, and nia}^ say that the sample 

 ent shows this stone to be most admirably adapted for the pur- 

 pose. 



'■ It is practically identical in composition with the limestones 

 from which some of the best cement in this country is produced, 

 viz., the Lias beds occurring in Warwickshire and South Wales, 

 The followino- is an analysis showing the average composition 

 of the stone : — 



Carbonate of lime M.H2 per cent. 



Total loss on ignition 39.00 



Matter soluble in hydrochloric acid . . . 89.48 

 Matter insoluble in " " .. 10.52 " 



Composition. 



Silica 9.94 



Alumina ... 2.06 



Ferric oxide .89 



Lime 47.14 



Magnesia 78 " 



Sulphuric anhydride '. Nil. 



Sulphur (as sulphides) 34 



Carbonic anhydride 38.57 



Combined water 09 " 



Alkalies and loss 24 



100.00 



" It will be noticed that the analysis, although more detailed 

 shows the stone to be practically of the same composition as the 

 English Lias stones above referred to, the composition of which 

 is as follows : — 



Moisture and organic matter 1.(50 per cent. 



Silica 11.15 



Alumina 1.97 " 



Ferric oxide. 3(5 " 



Carbonate of lime 84.55 " 



Loss ... .37 



100.00 



