150 
STOCKS: CONCRETKJN CALLED ACRESPIRE. 
Specimens from two localities near Halifax were analysed, with 
the results given below: — 
/ Ferric Oxide 
I Ferrous Oxide 
Soluble' ■'^^^^S^^^^^ Oxide 
Alumina... 
in 
HCl. 
Lime 
Magnesia ... 
Carbonic Acid 
Silica 
Phosphoric Acid 
Silica insoluble in HCL (sand) 
Moisture ... 
Alkalies and loss . . . 
RiNGBY, 
4-12. 
0-92. 
19-37. 
1213. 
016. 
trace. 
60-90 
0- 92. 
1- 48. 
10000. 
LiGHTCLIFFE. 
217 
trace. 
0-43. 
20-53. 
trace. 
1631. 
0-52. 
58-23. 
0- 25. 
1- 56. 
10000. 
The above figures show how well the two specimens agree in 
composition. 
I append an analysis of a white sandstone, also from Halifax, to 
show in what points the acrespires differ from the sandstone. 
Silica (soluble) 
3-10. 
Silica (insoluble) ... 
89-23. 
Alumina ... 
1-34. 
Ferric Oxide 
2-72. 
Lime 
O'lO. 
Alkalies 
1-17. 
Loss on ignition. (Water and Organic Matter) ... 
1-55. 
99-21. 
On comparing the three analyses together, we see that the 
essential difference is, that the acrespire contains about 31 or 
32 per cent, of carbonate of hme, which has been introduced into 
its formation. 
