356 SCIENCE PROGRESS 



of his biological knowledge under Prof. Weldon, and we are grateful for this 

 permanent record of them in what is a sort of memorial form. Although over 

 military age he enlisted at the beginning of the war, and later received a 

 commission in the Worcestershire Regiment. As a captain he led his men in the 

 advance on Gallipoli on June 4, 191 5, and fell in action on that day. A short 

 biographical note by Dr. R. R. Marett and a good portrait add considerably to 

 the value of the present book. 



Jenkinson was practically the only man in this country working on experimental 

 embryology, in which subject his own researches had shown him to be a master. 

 The lectures were not merely a record of his own work, too modestly referred to, 

 but also a critical account of the recent advances in other countries. They 

 provide therefore a very useful sketch of the position of our knowledge on three 

 topics : Growth and the Structure of the Germ-Cells, Cleavage, and Differentiation. 

 Each is treated in the thorough manner characteristic of the author, and his 

 powers of criticism enabled him to deal with a large amount of information in a 

 way that is most useful to those not specialists in this branch of zoology. 



A useful literature list and index are added. 



The whole forms a terse but very instructive and suggestive review of the 

 fascinating study of experimental embryology in regard to the very early stages. 



C. H. O'D. 



Studies in Insect Life and Other Essays. By Arthur Everett Shipley, 

 Sc.D., F.R.S. [Pp. ix + 338, with ir illustrations.] (London : T. Fisher 

 Unwin, Ltd., 1917. Cash price in Great Britain, 10*. 6d. net.) 



Under the above title Dr. Shipley has collected and reprinted in book form a 

 number of delightful and instructive articles which were previously distributed 

 among various periodicals and scientific journals. These essays relate chiefly to 

 zoological subjects, but are penned as much for the benefit of the general reader 

 as for the student. The subjects are ably treated, and the lucid and fascinating 

 style of the author will render the perusal of these essays a real enjoyment to the 

 reader, who will obtain from them much valuable information with little effort 

 upon his own part. 



The studies in insect life are devoted to certain forms which, just now, are of 

 particular interest owing to their increased importance in time of war ; and to 

 those wonderful creatures, the honey- and humble-bees, whose habits and social 

 economy can never fail to evoke man's admiration. Three essays relating to 

 maritime subjects follow — 1. The romance of the ocean depths, with some account 

 of those famous expeditions which elucidated so many of their mysteries ; 2. Our 

 sea-fisheries and the important results obtained from the investigation of them 

 during recent years ; and 3. The oceanographical reminiscences of Sir John 

 Murray. A chapter is next devoted to the diseases (Coccidiosis and Strongylosis) 

 and numerous parasites of that unhappy bird the Grouse. This is followed by 

 two historical articles on science — Zoology in the time of Shakespeare, an essay 

 dealing more particularly with the acquaintance of the subject displayed by the 

 poet in his writings, and the Revival of Science in the Seventeenth Century. 

 Hate, that emotion so much in evidence in these terrible days, forms the subject of 

 the concluding essay, and is most interestingly written throughout. Of especial 

 interest is that part which treats of the physiological conditions accompanying 

 and perhaps producing the ultimate manifestation of this passion-rage. 



H. F. C. 



