Medical Officer, Bureau of Health, Manila, Phili'P']Yines· TABLE OF CONTENTS I. HISTORICAL II. IMPORTANCE OF THE TUBERCULOID FORM III. THE SOUTH AMERICAN CLASSIFICATION IV. COMMENTS ON SOUTH AMERICAN CLASSIFICATION

I. HISTORICAL II. IMPORTANCE OF THE TUBERCULOID FORM III. THE SOUTH AMERICAN CLASSIFICATION IV. COMMENTS ON SOUTH AMERICAN CLASSIFICATION 1. The question of transformation from the tuberculoid to the lepromatous type. 2. The difficulty of clinically differ entiating the neural cases. V. THE NATURAL COURSE OF THE INFECTION IN LEPROSY VI. A FOURTH FUNDAME NTAL TYPE OF LEPROSY VII. A PROPOSED MODIFICATION OF THE PAN-AMERICAN CLASSIFICATION 1. Histological basis of the proposed modified classification 2. Clinical basis VIII. SUMMARY