152 SCIENCE PROGRESS 



hypophysis to account for everything, Mendelian segregation and recomhina- 

 tion." The book is marred in places by clumsily worded sentences, e.g. 

 " There is no question but that animals behave the same as plants in heredity." 

 It is, however, a useful work, especially from the point of view of plant 

 breeding and in setting forth the experimental results of the subjects it 

 handles. C. H. O'D. 



A Laboratory Outline of Embryology, with Special Reference to the Chick 

 and the Pig. By Prof. F. R. Lillie and C. R. Moore. [Pp. 66.] 

 (Chicago : The University of Chicago Press, 1919. Price 35 cents.) 

 This little book has already proved its value and needs no introduction to 

 embryological laboratories. The present is a revised edition giving direc- 

 tions and a provisional time-table mapping the work out so as to make it 

 cover about sixty hours. It is assured of a continued support. 



C. H. O'D. 



A Laboratory Manual for Elementary Zoology. By L. H. Hyman. [Pp. 

 149.] (The University of Chicago Press, 1919. Price $1.50 net.) 



This is a manual for use in the practical classes in elementary zoology in the 

 University of Chicago. The course commences with a study of the frog 

 in some detail and then passes on to the lower forms, because, the author 

 says, this method has been found more successful from the point of view of 

 teaching than starting with the lower forms first, and with this we are in 

 entire agreement. It contains full instructions and a number of useful 

 hints. While expressly intended for the work in Chicago, it is not without 

 interest in other colleges where a similar course is carried out. 



C. H. O'D. 



Problems of Fertilisation. By Prof. F. R. Lillie. [Pp. xii -f 278 with 



10 figures.] (Chicago : The University of Chicago Press, 1919. 



Price $1.75.) 

 This little book is, to use the author's own modest phraseology, a discussion 

 of the problems of fertilisation, and is a result of his own studies in this field. 

 It is a tlioroughly interesting and stimulating piece of reading. The past 

 history of the various problems treated is given together with a lucid and criti- 

 cal exposition of our present knowledge on them. As the author points out, 

 it is not possible to treat of these subjects in an ordinary textbook manner, 

 and the book gains much by not attempting to do so. A very just balance 

 is held between what may be termed the biological and physicochemical 

 explanations that have been put forward, and both are subjected to careful 

 examination and criticism. The value of the work is not alone in the actual 

 facts and theories with which it deals, but also in the manner in which it leads 

 up to the problems awaiting solution. 



It is unnecessary to call attention to the biological importance of the 

 phenomenon of fertilisation or to the writer's eminence in this field of work, 

 for both are well known. Suffice it to add that this excellent book should 

 be in the hands of all biologists who wish to learn the present position of the 

 investigations along these lines, and also it should be read by all students for 

 the inspiration and suggestions that it contains. . C. H. O'D. 



Lectures on Sex and Heredity. By F. O. Bower, J. Graham Kerr, and 

 W. E. Agar. [Pp. vi + 119.] (London: Macmillan & Co., 1919. 

 Price 5s. net.) 

 This little book contains six lectures delivered by the authors at Glasgow 

 University in the years 1917-18. It contains no new facts, but aims 

 at a simple and lucid exposition of certain of the aspects of Sex and Here- 



