REVIEWS 351 



secretion and actions of the digestive juices, with the changes undergone by the 

 products of digestion and of metabolism in the animal economy, and with the 

 processes and mechanisms of respiration and of thermotaxis. The subject is 

 presented, attractively, in the form of twenty-five lectures, in style somewhat 

 reminiscent of Bunge. The presentation is original. It bears throughout the 

 thumb-mark of its author, whose work adds the authority of the laboratory to that 

 of the rostrum. 



The translation is fluent and readable. It contains a few oddities, e.g. " Lab- 

 process," " Rest-nitrogen," " Electromotor power," which, for the most part, are 

 half-translated Germanisms, free from ambiguity, and do not materially diminish 

 the interest or the value of the volume. It is more seriously marred by omission 

 of dates from the prefaces. Apart from the words " Copyright 1916" on the back 

 of the title page there is nothing in the volume to imply when it was translated ; 

 nor anything, save an implication (in the translator's preface) that the German 

 edition appeared in or about 191 3, to fix the date of publication of the original 

 lectures. 



But the volume is of real value. It is described, very happily, by the trans- 

 lator as being " rather a guide to thought than to the technicalities of the 

 laboratory," and may be commended heartily to advanced students, to experi- 

 menters, and to those engaged in human and in veterinary medical practice as an 

 interesting and suggestive contribution to the subject with which it deals. 



W. L. S. 

 GEOLOGY 



William Smith: His Maps and. Memoirs. By T. Sheppard, M.Sc, F.G.S. 



{Proc. Yorks. Geo/. Soc. 1917, 19, pt. iii. pp. 75-253, 17 plates.) 

 This memoir is by far the most complete account extant of the epoch-making 

 work of William Smith, the father of English stratigraphical geology, as it is 

 set forth in his maps and memoirs. Especial attention is given to his stay in 

 Yorkshire during the latter part of his life, and to his scientific activities during 

 that period. At this time Smith made a geological map of the district of 

 Hackness, the extraordinary accuracy of which is illustrated by the severe test 

 of placing it side by side with the 6-inch geological map of the same district as 

 surveyed by the late C. Fox-Strangways in 1878. A new discovery of MSS. by 

 Smith has been made through relatives of R. Turnbull, who was a pupil of Smith's 

 during his sojourn at Hackness. These documents, which have been presented to 

 the museum of the Scarborough Philosophical and Archaeological Society, include 

 several short scientific papers, some of which are printed in extenso in appendices. 

 The memoir also contains a valuable account of earlier attempts than Smith's to 

 indicate soil-boundaries and other geological information on maps. Another 

 feature of interest is the inclusion of a series of notices of Smith's geological work, 

 testifying to the growth of the universal regard in which he is now held. The 

 work is profusely illustrated with fac-similes of Smith's maps and the title-pages of 

 some of his works. G. W. T. 



BOTANY 



Carbon Assimilation : A Review of Recent Work on the Pigments of the Green 



Leaf and the Processes connected with them. By Ingvar JoRGENSEN and 



Walter Stiles. [Pp. iv + 180, with 18 figs.] (London : William Wesley 



& Son, 1917. Price \s. net.) 



It is well recognised that without the sun life on this planet would be impossible, 



but it is not always so clearly understood that without the green plant and its 



