25 
importance. A mistake under an official survey can hardly 
be rectified by an amateur geologist like myself, but it is 
desirable that the exact nature of this so-called “ Red Rock 
Fault” should be more carefully investigated, and where 
necessary rectified in the Government maps. So far as my 
knowledge extends there is no more evidence of a fault 
between Macclesfield and Stockport, where the trias and 
permian beds cover the coal measures, than is to be found 
on the eastern side of the Pennine chain between Sandyacre 
and Sunderland, where carboniferous strata disappear under 
permian. 
“ On the Combinations of Phosphate of Lime and Sul- 
phurous Acid,” by Dr. B. W. Gerland, Macclesfield. 
Communicated by Professor Roscoe, Ph.D., F.R.S. 
Phosphate of Lime, in whatever state it may be, readily 
dissolves in an aqueous solution of Sulphurous acid. The 
solution can be obtained of great strength ; thus, from 
freshly precipitated Tribasie Phosphate ol Lime a liquor 
was prepared of 1*3 specific gravity, and from Bone Ash 
one of 1*1708 specific gravity. The former contained in 
1000 cc. 
Sulphurous Acid ......... 
......... 218*38 
grm 
Sulphuric Acid 
......... 0*70 
Lime 
101-79 
v> 
Phosphoric Acid ..... 
......... 82*89 
403-76 
55 
These figures agree tolerably with the formula SCaO, 
P0 5 +6 S0 2 as the comparison with the calculated table 
shows : 
3CaO ... 84 ... 98*20 
P0 5 ... 71*4 ... 82*89 
6S0 2 ... 192 ... 224*45 
405*54 
