PREFACE 



THE following pages contain an account of re- 

 searches on Immunity, carried out in the Patho- 

 logical Department of Glasgow University and 

 Glasgow Western Infirmary. Practically all the 

 work has been already published, and I have pleasure 

 in expressing my thanks to the Council of the Royal 

 Society and to the Proprietors of the Lancet, British 

 Medical Journal, Journal of Hygiene, and Journal 

 of Pathology and Bacteriology, for permission to 

 reproduce the papers in the present form. The 

 volume is essentially a record of original work, and 

 no attempt is made to give a historical review of 

 the whole subject ; due reference is, however, given 

 to the results of others, available at the time of first 

 publication, in connexion with the various subjects 

 discussed. The papers have been arranged to give 

 a continuity to the whole, and this arrangement 

 approximately corresponds with the order of publica- 

 tion of the several portions, the only important 

 exception being in the case of the section on * the 

 Filtration of Serum-Complement ', which was the 

 last to appear. 



A list of the papers incorporated is appended, 

 and from this the places and times of publication 

 of the several portions of the book will be readily 



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