1 44 Notices respecting New Books, '■ 



4han thati-deduced from electric conductivity (25° Ostwald)-. 

 Much better is tbe agreement between the constant from 

 freezing-point and tbe constant from electric conductivity, 

 if the practically found £=1*84 is used ; tbe constant is well 

 obtained then also in the case of trichloracetic acid. See 

 A' and K' in Table VII. 



I may be permitted to express my heartiest thanks to the 

 authorities of Christ Church and to Mr. A. G. Vernon Har- 

 court for kindly placing the resources of their laboratory at 

 my disposal. 



"Christ Church, Oxford. 



VII. Notices respecting New Books. 



Annals of British Geology, 1893. By J. E. Blake, M.A., F.G.S. 



8vo., xxiv and 365 pages, with 90 illustrations, February 1895. 



Dulau & Co., London. 

 HHHIS digest of Books and Papers published during the year 

 -*- (1893), with an Introductory Eeview, is a welcome continuation 

 of three former volumes, already noticed in the 'Philosophical 

 Magazine.' The subjects taken in order from page 1 to page 301 

 are: — 1. General Geology ; 2. Stratigraphical Geology ; 3. Palae- 

 ontology ; 4. Paleobotany ; 5. Mineralogy ; 6. Petrology ; 7. Eco- 

 nomical products ; 8. Maps and Sections relating to England and 

 Scotland. Notices of notes and memoirs on Eoreign Geology, 

 published in Britain, taken in much the same order as the above, 

 occupy pages 302-353. Three good Indexes are found at pages 

 355-365. 



The aim of this work is to provide annually for students of 

 Geology a condensed account of all that has been done in the 

 science so far as the British Islands are concerned. Eor this 

 purpose the various papers and other publications are classified 

 under larger and smaller subdivisions, so that the whole work is a 

 kind of subject-index. 



The several papers are either merely recorded, or more or less 

 fully abstracted. The "Introductory Eeview" aims at giving a 

 succinct account of the general progress in Geological Science, 

 and treatment of disputed questions, during the year concerned, 

 based on the information afforded by the said publications. 

 Where desirable and convenient, especially with new species of 

 fossils, figures (copied by " process ") are given in the text. In 

 the abstracts of the papers the ideas advanced or supported by the 

 several authors are represented from their own points of view ; in 

 the " Introductory Eeview " the reviewer (he objects to be regarded 

 as a "compiler" of this most careful and laborious work) writes 

 critically on his own responsibility. 



The number of publications dealt with each year has varied 



