PREFACE 



Lendrum's department, and all the photomicrographs were taken there with 

 the aid of his technician, Mr. J. W. Corkhill. 



Finally, I wish to place on record the debt of gratitude which Dr. West 

 and I owe to the constructive criticism and generous advice of Sir Henry Dale 

 throughout the whole of this work. Sir Henry, himself a pupil of Ehrlich, was 

 among the first to accept our evidence on the cytological location of histamine 

 in mast cells and to suggest fruitful means for obtaining further information. 

 For our part we were honoured in being invited in April 1955 to take part in 

 the Symposium on Histamine organized by the Ciba Foundation to celebrate 

 Sir Henry's eightieth birthday. Sir Henry now does me the even greater honour 

 of writing a foreword to this account of a problem on which he himself has 

 contributed so much. 



JAMES F. RILEY. 

 Dundee, 1959. 



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