"The first 3 studies in this series were published in the Journal of experimental medicine ; no. 1 in v. 34, and nos. 2 and 3 in v. 38." --- U.S. Superintendent of Documents, Catalogue of public documents, 1923/25, p. 1671. Includes bibliographies.

1. Active immunization of monkeys against pneumococcus type I pneumonia with pneumococcus type I vaccine / by R.L. Cecil and G.I. Steffen --2. Active immunization of monkeys against pneumococcus types II, III, and IV pneumonia with the homologous pneumococcus vaccine / by R.L. Cecil and G.I. Steffen -- 3. The nature of pneumococcus antigen / by W.A. Perizweig and G.I. Steffen -- 4. Active immunization of monkeys against pneumococcus pneumonia by means of intratracheal injections of pneumococcus vaccine / by R.L. Cecil and G.I. Steffen -- 5. The treatment of experimental pneumococcus pneumonia in monkeys with pneumococcus antibody solution / by R.I. Cecil and G.I. Steffen --6. The fate of pneumococcus protective bodies when injected into normal animals and man / by D.R. Rhoades -- 7. The protective substance in pneumococcus pneumonia with special reference to bacteriemia and specific treatment / by H.S. Baldwin and D.R. Rhoades. The use of optachin base in the treatment of lobar pneumonia / by H.S. Baldwin and D.R. Rhoades.