viu PREFACP: 



several Vertebrates forms as good a training as any for 

 beginners more especially in the case of medical 

 students. 



I am indebted to Mr. H. Spencer Harrison, B.Sc., 

 Demonstrator of Biology in this College, for much 

 assistance in testing and improving the practical 

 instructions, as well as for various suggestions and for 

 help while the work was passing through the press. 

 The new figures were redrawn from the originals by 

 Mr. M. P. Parker. 



W. N. PARKER. 



UNIVERSITY COLLEGE, CARDIFF, 

 November, 1899. 



PREFACE TO THE FOURTH EDITION 



IN addition to a careful revision and to numerous minor 

 modifications, the last chapter of previous Editions 

 has been subdivided and largely re-written, and the 

 embryology of the chick and rabbit treated in some- 

 what further detail. Certain of the illustrations have 

 been replaced, ar.d several additional figures inserted. 

 A change has also been made as regards the type 

 throughout, larger type being used for the Practical 

 Directions. 



I am indebted to my colleague, Mr. T. H. Burlend, 

 for many useful criticisms and suggestions. 



W. N. PARKER. 



February, 1916. 



