24 



Some critical remarks must be made. The authors claim that the book summarises the embry- 

 ology of frog and chick in sufficient detail for degree level. This may be doubted, however, since 

 particularly the early stages (neurula and tail bud stages of the frog, primitive streak and head 

 process stages of the chick) are insufficiently represented to provide a dynamic picture of 

 morphogenesis necessary for understanding experimental embryological data. 



The reason given by the authors for not selecting the best possible slides for illustration seems 

 rather doubtful, especially for a book the usefulness of which depends on its didactic qualities. 



The species of frog used is not stated. No reference is made to stage numbers of existing 

 normal tables (although Hamilton and Hamburger stages are given in the table of chick 

 development). Finally, the abbreviations used to designate planes of sectioning are not explained. 



12. A TEXTBOOK OF HUMAN EMBRYOLOY 



2nd edition, 1963 



by R. G. Harrison Blackwell Scient. Publ. 



248 pp., 140 figs. Oxford 



Price: 75 s. 6 d. 



The first edition of this book appeared in 1959 and has been well received. 

 It has the advantage of being shorter than most textbooks of its kind. For the 

 second edition the book has hardly undergone any change. Inaccuracies have 

 been corrected and the text brought into line with recent advances wherever 

 necessary. A few figures have been omitted and one has been replaced. The 

 size of the book has remained practically the same as before. 



13. FOUNDATIONS OF EMBRYOLOGY 



2nd edition, 1964 



by B. M. Patten McGraw-Hill Book Company 



522 pp., 1008 drawings and New York, San Francisco, London, Toronto 

 photographs grouped as 327 Price: 81 s. 6 d. 



illustrations. 



The first edition of this textbook appeared in 1958. The basic organisation 

 of the text has remained unaltered. The only difference in the table of contents 

 is that the pharynx and its derivates and the major endocrine glands, which 

 were previously treated in various different chapters, have all been brought 

 together in one chapter. 



Newly available information has been incorporated in the text. The emphasis 

 on functional aspects of embryonic structures has been increased. A number 

 of the illustrations have been redrawn, and in many others the labelling has 

 been rearranged or expanded. There are 14 new illustrations (composed of 

 some 50 new figures), most of which centre on the functional interpretation 

 of the relationships of embryonic structures. 



The useful section entitled "References for collateral reading" has been some- 

 what expanded by the inclusion of more recent references. 



Typographically the second edition meets the same high standards as the 

 first. 



