viii PREFACE 



Catalogue of the Surgeon General's Office, and in particularly available 

 form in the Quarterly Cumulative Index of the American Medical 

 Association. Every effort has been made to give credit where it 

 belongs ; if omissions or errors have been made they are due to the 

 vast amount of material that has been accumulated on this subject 

 rather than to intentional oversight. 



Our thanks are due to our colleague, Doctor Maurice L. 

 Richardson, for extremely valuable aid in the revision of the manu- 

 script, to Mr. E. L. Miller for three important microscopic draw- 

 ings, to Miss May E. Treter and Miss Catherine E. Lennon for 

 faithful and painstaking clerical work. Mr. W. T. Brownlow, of 

 Cleveland, has made the line drawings and Mr. E. F. Faber, of 

 Philadelphia, the drawings of the lungs in anaphylactic shock. We 

 have taken materials from certain journals and make grateful 

 acknowledgment by reference in the text. 



January, 1921. 



HOWARD T. KARSNER, 

 ENRIQUE E. ECKER. 



