CRGT2**) " [July, 
VII. GEOLOGICAL MAPS: THEIR RELATION TO AGRI- 
CULTURE AND COAL SUPPLY. 
1. A Geological Map of England and Wales. By G. B. Gree- 
nough, Esq., F.R.S. (on the basis of the Original Map of 
Wilham Smith, 1815). New edition, revised and improved, 
under the superintendence of a Committee of the Geological 
Society of London, from the Maps of the Geological Survey of 
Great Britain, 1836-63, and Maps and Documents contributed 
by Sir R. I. Murchison, Professor Phillips, Joseph Prestwich, 
R. A. C. Godwin-Austen, and others. Six sheets. Scale, 
nearly six miles to one inch. , Published by the Geological 
Society, July, 1865. 
2. Geological Map of England and Wales. By Andrew C. Ramsay. 
Third edition. One sheet. Scale, twelve miles to one inch. 
London: Stanford, 1866. 
3. First Sketch of a new Geological Map of Scotland. By Sir R. 
I. Murchison, Bart., K.C.B., F.R.S., and Archibald Geikie, 
F.RS.E., F.G.S. One sheet. Scale, twenty-five miles to one 
inch. London, 1861. 
4. General Map of Ireland, to accompany the Report of the Rail- 
way Commissioners, showing the principal Physical Features 
and Geological Structure. Geologically Coloured by Sir R. J. 
Griffith, Bart., LL.D., i 1855. Six sheets. Scale, four 
miles to one inch. London and Dublin. 
5. Geological Map of Ireland, to accompany the Instructions to 
Valuators appointed under the 15th and 16th Vic., cap. 68. 
Reduced from the large map of 1855. Scale, about seventeen 
miles to one inch. 
6. The Geology of the Country round Stockport, Macclesfield, Con- 
gleton, and Leek. Explanatory of Quarter Sheets, 81 N.W. 
and S.W. of the Map of the Geological Survey of Great 
Britain. By Edward Hull, B.A., F.G.S., and A. H. Green, 
M.A., F.G.S. London, 1866. 
Tuat geological maps are often puzzles to the public is not won- 
derful ; but that they are sometimes a source of discussion to men 
of science* is much to be deprecated. If, at the outset, we endea- 
vour to answer comprehensively the question, What is a geological 
map ? we are met with some considerable difficulties, and we can 
only pretend to do so im accordance with the practice of our 
geological surveyors, and not with what we conceive to be the 
fundamental principle of the subject. 
* See ‘ Reader,’ March 31, 1866. 
