322 Reviews — Stanford's Geological Map of London. 



do upon its whole contents. Those chapters on locality, first 

 appearance, extinction of species, migration, and recurrence, in the 

 Silurian Thesaurus, although not given in the Devonian and Car- 

 boniferous volume under notice, should be referred to as master- 

 pieces of logical deduction. Continental and American geologists 

 and authors will gladly hail the work before us, and wish that 

 length of life could be spared to its author to complete in the 

 same manner the Secondary formations of the world. The geologist 

 deals with time, and time has dealt kindly with the author of the 

 Catalogue of the Flora and Fauna of the Devonian and Carboniferous 

 periods. Great is the muster-roll of past life that he has chronicled 

 through time in this volume, nor will the chronicler of the future 

 fail to inscribe among the names of the great and good in geological 

 science, who have by their patient labours contributed to the store 

 of our common knowledge, the honoured name of John J. Bigsbt. 



YI. — Stanford's Geological Map of London and its Suburbs. 

 Scale 6 inches to a mile. The Geology compiled from the Maps, 

 etc., of the Geological Survey by J. B. Jordan. 24 Sheets in 

 Portfolio, with Index. (1878.) 



THE Geological Survey, having published no other map than the 

 ordinary one, on the scale of an inch to the mile, Mr. Stanford 

 has boldly come forward to supply the want of a larger one, using 

 for the purpose his well-known " Library Map of London." The 

 work is substantially the same as that which forms the surface of 

 the large model of London in the Museum of Practical Geology, 

 and as Mr. J. B. Jordan was employed in the colouring, etc., of that 

 model, our enterprising publisher has done well in securing his 

 services in the compilation of the geological information. 



The area of the district represented may be judged from the 

 places shown near its corners, which are as follows : — Wimbledon 

 on the S.W., beyond Hampstead on the N.W., Leyton on the N.E., 

 and Beckenham on the S.E. The formations shown by distinctive 

 colours are Alluvium, Brickearth, Gravel and Sand, Lower Bagshot 

 Sand, London Clay, Oldhaven Beds, Woolwich and Beading Beds, 

 Thanet Sand, and Chalk. It will be seen, therefore, that those 

 surface-deposits of gravels, brickearth, etc., which have so much 

 effect on the character of the ground, although of small thickness, 

 are not neglected, but are shown equally with the thicker formations 

 (London Clay, Chalk, etc.). It has not been thought advisable, how- 

 ever, to distinguish the gravels of different ages (though this is done 

 on the above-mentioned London Model), those of older date occurring 

 in such very small areas as to make the expense of employing two 

 additional colours not worth incurring. 



Of course this map does not pretend to compare for accuracy 

 with the " Six-inch " Maps of various northern parts issued by the 

 Geological Survey, the geology on which has been actually surveyed 

 on that scale ; it is of necessity, to a great extent, an enlargement of 

 the '•' One-inch " Map, as far as the geology is concerned ; though 



