1. Schroder and Cooper's (1930) epidemic of respiratory infections among children ranging from coryza to lobar pneumonia due to pneumococcus type v is an exception, but type v is one of the " epidemic " types.
2. Pneumococcus types I, II, v, VII, XIV, and XXII seem to be the principal " epidemic" types ; they are usually associated with lobar pneumonia (types XIV and XXII particularly in children) and are rarely found in the throats of the healthy population except among intimate contacts of infected persons. Types III, IV, VI, VIII, XIII, XVIII, XIX, and XXIII are perhaps the predominating saprophytic or potentially pathogenic pneumococci ; of these types IV, VI, XIX, and XXIII are commoner in children and therefore are frequently isolated from cases of bronchopneumonia in the young ; types III, VIII, and XVIII occur more often in adults and are associated with lobar pneumonia and bronchopneumonia, particularly in older and debilitated persons.
3. LOBAR PNEUMONIA IN CHILDREN
4. RESULTS OF PROPHYLACTIC INOCULATION AGAINST PNEUMOCOCCUS IN 12,519 MEN
5. TYPE-SPECIFIC ORGANISMS IN ACUTE PNEUMONIA AND IN CONVALESCENTS AND CONTACTS