1. For a review of the literature on filtration experiments in trachoma, see Stewart, F. H. Eighth Annual Report Giza Memorial Ophthalmic Laboratory, Cairo, 1934, p. 152. Also Julianelle, L. A., and Harrison, R. W. Amer. Jour. Ophth., 1935, v. 18, p. 133.
2. Thygeson, P., and Proctor, F. I. Arch. of Ophth., To be published.