I. GEOLOGY. 689 



The index notes briefly the quality of the soils ; the character of the land, 

 whether chiefly arable, pasture, or woodland ; and mentions a few of the more 

 noteworthy crops of Kent. 



3250. Diagram illustrating the comparative Agriculture of 

 England and Wales. William Topley, F.G.S. 



The object of this is to show the relative agricultural value of the various 

 counties, which can best be done by exhibiting the per-centage acreage of the 

 different crops. The numbers are obtained from the " Agricultural Returns " 

 for 1869 ; the area of " woodland," and that of permanent pasture as divided 

 between grass and hay, being added from the returns for 1871. The absolute 

 numbers vary slightly in different years, but the variation of the per-centage 

 numbers is very small. [For the results obtained from these maps and 

 diagrams, see Journ. Roy. Agric. Soc., ser. 2, vol. vii., p. 268, 1871. ] 



3251. Maps and Table illustrating William Smith's first 

 efforts towards producing his Geological Map of England. 



The Geological Society of London. 



(1.) Original table of the order of strata and their imbedded organic 

 remains in the vicinity of Bath, as examined and proved by William Smith 

 prior to 1799. The MS. is in the handwriting of the Rev. B. Richardson, 

 of Farley, who wrote it down from the dictation of William Smith, in the year 

 1799. 



(2.) A geological map of the district around Bath, prepared by William 

 Smith about the same perio'd. 



(3.) Smith's first small geological map of England. 



(These maps were presented by William Smith to the Geological Society 

 of London in the year 1831, on the occasion of his receiving at the hands 

 of their president, Professor Sedgwick, their award of the Wollaston medal 

 and donation fund.) 



3252. Maps illustrating the rise and gradual progress of the 

 art of Geological Surveying in the British Islands and the 

 Colonies. The Geological Society of London. 



Win. Smith's first large geological map of England, published in the year 

 1815. 



G. B. Greenough's geological map of England, the first edition, published 

 in the year 1819. 



Bain's first geological map cf South Africa. 



Bain's smaller geological map of South Africa. 



John Phillips' s geological map of Yorkshire, first edition. 



Farcy's section across the Weald. 



Section across the Weald by John Farey in 1806. 



This horizontal section from London to Brighton, upon the scale of 1 inch 

 to a mile, was constructed by John Farey in 1806. It was never published, 

 but several MS. copies were made of it. It is of great historical interest as 

 being the first illustration of the anticlinal structure in the south-east of Eng- 

 land, of the truncated chalk escarpments, and of the proofs of enormous denu- 

 dation which must have taken place in the district. 



3252a. A Series of Indexes of Colours and Signs 

 employed in the Maps and Sections of the Geological 

 Survey of the United Kingdom. 



The gradual advance of English geology (as expressed by maps) is shown 

 to some extent by the successive editions of the Index of Colours used by the 

 Geological Survey. 



39508. X x 



