468 - PRINCIPLES OF EMBRYOLOGY 



of the kind they suggest to account for such complex forms as those of 

 the parts of the brain, and we must certainly continue to search for more 

 definite bases on which the patterns could be built. 



SUGGESTED READING 



Bonner 1952, Holtfreter 1943-44, Needham 1936a, Weiss 1950Z), Stem 1954. 



For an early and still most stimulating account of cell-specific adhesiveness (in sponges) 

 see Huxley 1911, 1921. 



ACKNOWLEDGEMENTS 



It is a pleasure to express my gratitude to the numerous persons who 

 have given me permission to utihse already-published figures. These 

 include authors, editors of journals and publishers. The caption to each 

 figure includes a reference to the work from which it was taken, the full 

 title of which will be found in the Bibliography. Most of the original 

 figures were drawn by Mr. E. D. Roberts, for whose care and skill I am 

 most grateful. 



And to make an end is to make a beginning. 

 The end is where we start from. 



•k -k -k -k -k 



We shall not cease from exploration 

 And the end of all our exploring 

 Will he to arrive where we started 

 And know the place for the first time. 



From Little Gidding by T. S. EHot. 



