REVIEWS 715 



most probable basis and to indicate the probable history of events in the order 

 thus suggested." 



Nor is the author overbold in his attempts at restoration of the conditions of 

 Lower Palaeozoic times and it is not until the less highly disturbed rocks of Upper 

 Palaeozoic age are considered that he speaks with more certain voice. The 

 chapter on the Carboniferous Period shows the great progress that has been made 

 since the appearance of the last edition and incidentally illustrates the author's 

 careful consideration of the most recent works on the subject. 



The term Vralo-Permian Period applied to the time which elapsed between 

 the close of the Carboniferous and that of the Permian Periods seems to us an 

 improvement on the unsatisfactory expression Permo-Carboniferous Period which 

 has been so much used. The latter expression should, strictly speaking, be appHed 

 to both Carboniferous and Permian Periods. 



The chapter on the Vralo-Permian and Triassic Periods show how fascinating 

 a story can now be woven about a time when the deposits formed in our island 

 have a somewhat monotonous character. 



In treating of the Jurassic and Cretaceous Periods, Mr. Jukes-Browne is 

 concerned with a subject of which he is a master. The two chapters which are 

 devoted to the rocks of this period are of very high interest and merit. 



In Tertiary times the existing features were gradually coming into shape and 

 in the latter part of the book the work of sea, rivers and land ice in modifying 

 the surface of the ground is clearly indicated. 



The style of the book is straightforward and clear ; the maps and diagrams are 

 excellent ; lastly, the value of the work is increased by the admirable reproductions 

 of photographs which occur at frequent intervals. 



The work is one which we regard as essential to the student of the Geology of 

 the British Isles, in order that he may understand the significance of the facts 

 recorded in his stratigraphical text-books. Nor should it be neglected by the 

 geographer. It may be regarded as a connecting link between the ordinary strati- 

 graphical te.xt-book and a purely geographical work such as Mr. Mackinder's 

 well-known book on Britain and the British Seas. To geologist and geographer 

 alike we cordially recommend it. 



John E. Marr. 



The Physiology of Reproduction. By F. H. A. Marshall, M.A., D.Sc, with 

 a Preface by PROFESSOR E. A. Schafer, F.R.S., and Contributions by 

 W. Cramer, D.Sc, and J. Lochhead, M.D., etc. [Pp. 706; 154 figures.] 

 (Longmans, Green & Co., 1910. Price 2\s. net.) 



In the short preface which he contributes to this book. Prof Schafer writes, 

 "This is the first time that the Physiology of Reproduction has been presented 

 in a complete form." A reader, meeting this statement in the first lines of the 

 preface, is inclined to suspect the writer of exaggeration ; but as he goes through 

 the book chapter by chapter and finds no diminution in the wealth of matter 

 treated under each heading, he comes to agree that the adjective "complete" 

 is very nearly justified. Absolute completeness in such a subject is impossible 

 of attainment. The author states in the introduction that he has confined 

 himself chiefly to the reproductive phenomena of the Vertebrates, particularly 

 of the Mammals and has not attempted to deal, except very cursorily, with the 

 related phenomena of Variation, Heredity, Cytology, etc. No reasonable person 

 could expect all these subjects to be treated even in the 700 pages of which the 



