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A formula for the classification of cases of tuber-culosis according to the number of tubercle bacilli in the sputum. The following is the table as modified by Lawrason Brown: (1) One to four bacilli in whole preparation; (2) one on an average in many fields; (3) one on an average in each field; (4) two to three on an average in each field; (5) four to six on an average in each field; (6) seven to twelve on an average in each field; (7) thirteen to twenty-five on an average in each field; (8) fifty on an average in each field; (9) one hundred on an average in each field.