i62 DISCOVERY REPORTS 



gall bladder develops into an organ of much greater proportions than that of the fowl 

 at the same stage, etc.). 



With regard to the configuration of the body as a whole, and the underlying details of 

 the skeleton, the very early adaptation shown for an aquatic habit has been stressed, and 

 the contribution that penguin embryology has made to the question of the position of 

 these birds in relation to the avian stock has been discussed. 



ACKNOWLEDGMENTS 



My most grateful thanks are due to Professor Graham Kerr, whose unfailing interest 

 in the progress of this work and whose helpful criticisms of it have been a constant 

 encouragement to me. 



The work of the artists who have been responsible for the illustration of the report is 

 an eloquent testimony to my indebtedness to them. Six of the figures in the Plates and 

 one text-figure (Fig. 2) are reproduced from drawings by Mr A. Kirkpatrick Maxwell. 

 All the remaining Plates and text-figures have been made for me by Miss C. Brown 

 Kelly, to whose enthusiasm for work in a new medium I must pay special tribute. 



Finally I have to thank the Discovery Committee for the opportunity of examining 

 their material, and Mr F. C. Fraser in particular for his skilful collection and pre- 

 servation of it. 



