JRevieics — Geological Surverj — Derby and Notts Coalfield. 269 



young workers stimulated by the healthy encouragement of direct 

 research as a part of scientific education. But I think it may also be 

 observed, and not alone in the case of such early dissertations, that 

 there is, on the whole, less care taken for the concise presentation of 

 results, and that the main principles are often submerged under a 

 flood of experimental detail. When the author himself has not taken 

 the trouble to digest his material or to prepare it properly for the 

 press, the reader may be tempted to judge of the care taken in the 

 work from the pains taken in its presentation. The tendency in some 

 subjects to submit for immediate publication the undigested contents 

 of note-books is one that we hear much of at the present time. It is 

 a matter that is difficult for publishing bodies to deal with, except 

 by simple refusal of imperfectly prepared material, with its danger of 

 giving offence to authors of recognized standing, but it seems not 

 unlikely that at present public scientific opinion would endorse such 

 a course of action. A related difficulty and one that contributes to 

 this trouble, is the tendency, noticeable in some public scientific 

 organizations, to imagine that their activity is estimated by the 

 number of pages of printed matter they can produce in the year. 

 Probably no consideration is further removed than this from the mind& 

 of the educated public, whose judgment is alone worth considering." 



I?, E "V I E "VT" S_ 



I. — Geological Survey of England and Wales. Sheet 125 : 



Dekby. Price Is. Qd. 

 Memoirs of the Geological Survey of England and Wales. 



Explanation of Sheet 125 : The Geology of the Southern 



Part of the Derbyshire and Nottinghamshire Coalfield. 



pp. 199. Price 3s. 



0]Sr the scale of 1 inch to the mile only one geologically coloured map- 

 of this area is published which shows details of both solid and 

 drift geology. AVe are told in the preface, " the distribution of 

 the drift is not sufficiently great to obscure the general structure of 

 the district." 



The map is one of the new colour-printed series, and is full of 

 detail and a great advance on the last edition in every way. Yery 

 elaborate legends are given in the margins, and we note a most useful 

 novelty on the lower margin, i.e., an admirable coloured transverse 

 section from west to east across the most important part of the map 

 from a view of structure. Everyone concerned in the production of 

 the map is to be most highly congratulated on its wealth of detail and 

 general accuracy. 



The memoir is written by Messrs. Gibson, Pocock, Wedd, and 

 Sherlock, with notes by Mr. Fox Strangways, and the striking note of 

 the volume is the application of palaeontological data throughout the 

 parts dealing with the Carboniferous rocks. 



The Carboniferous Limestone in the area consists of the portion of 

 the jSTorth Staffordshire -Derby shire anticlinal at Wirksworth and the 

 Crich inlier, which are shown to belong to the Lonsdaleia subzone of 

 the Lihunophyllum zone. The limestones are succeeded by the 



