186 Reviews — Clement ReiiVs Prc-Glacial Flora of Britain. 



Questions of economic interest, such as water supply, minerals of 

 the Knysna District, salt deposits, occui'rences of asbestos, etc., are 

 not lost sight of. The Report for 1905 includes a detailed description 

 by Mr. du Toit of the Indwe Coalfield, and is accompanied by 

 a map on a scale of one inch to 1 J miles, showing the outcrops of the 

 Guba and Indwe seams and the position of shafts and boreholes. 



On the separately issued colour-printed maps, which maintain the 

 clearness of the earlier issues, the horizontal section at the foot of 

 sheet 45 is a welcome innovation. 



Where so much is given it were indeed ungracious to ask for more. 

 In many respects the Reports are books of reference ; the reader, 

 therefore, would welcome the free use of headlines and the insertion 

 of page references to the tables of contents which accompany the 

 descriptions of each separately surveyed area. Reference figures 

 and lettering on the diagrams and illusti'ations would be better if 

 donble, and in some cases treble the size, for they are sometimes so 

 minute as to be scarcely legible, even imder a hand-lens. Dip-arrows 

 and figures on the black and white maps are also much too small and 

 may easily escape notice. W. G. 



VI. — The Pre-Glacial Flora of Britain. 



IN the Geological Magazine for 1888, p. 567, we reprinted a list 

 of the plants then recorded by Mr. Clement Reid (Ann. of 

 Botany, August, 1888) from the Pre-glacial, Inter-glacial, and Post- 

 glacial deposits of Britain. The Pre-glacial plants were obtained 

 from the Cromer Porest-bed, and the number then enumerated was 58. 

 By his indefatigable labours, especially with regard to plant-seeds, 

 he was enabled to increase the number of species to 78 in 1899, when 

 he published his instructive work on "The Origin of the Jk-itish 

 Plora." With the aid, meanwhile, of an enthusiastic lady- geologist, 

 his wife, Mr. Reid has almost doubled the number of plant-remains 

 from the Pre-glacial deposits of the Norfolk and Suffolk coasts. No 

 less than 147 are now recorded in a paper " On the Pre-Glacial Flora 

 of Britain," read before the Linneati Society in June, 1907 (Journ. 

 Linn. Soc. Botany, vol. xxxviii, 1908, p. 206). This paper is 

 particularlj' valuable, not only on account of critical remarks on the 

 species, and on the methods of preserving and identifying the seeds 

 and fruits, but for the series of five ])hotograpliic plates containing 

 •181 figures of the species. In their concluding remarks Mr. and 

 Mrs. Reid state that the plants " sugjiest climatic conditions almost 

 identical with those now existing, though slightly warmer." 



Geological Society of Londo.v. 

 February imh, 1908.— Sir Archibald Geikie, K.C.B., D.C.L., Sc.D., 

 Sec. R.S., President, in the Chair. 

 The following communications were read : — 



1 . " The Two Earth-Movements of Colonsav." By William Bourke 

 Wright, B.A., F.G.S.i 



^ Communicated by permissiou of the Director of H.M. Geological Survey. 



