c. Rabbit Bye Circulation. (E, Anderson with K, Woodward, and S,Rothermel): Measurements have been made of the time of clearance of Na-22 injected into the anterior chamber of the rabbit eye. Half-times of 70 to 90 minutes (with one run giving a low value of 33 minutes) have been obtained. The method seems capable of considerable precision. One eye treated with pilocarpine showed an increased turnover rate, the half-time dropping from 74 to 57 minutes on washing with pilocarpine. Measurenents have been begun on the normal intraocular pressure and on changes produced by adding or removing saline. Only preliminary results are available so far, indicating a normal pressure of about 25 mm Hg and a . ; volume coefficient dP/dV of about 1.6 mm Hg/ul. ~ The P-V curve seems to be re- versible and linear up to perhaps 40 441 added saline (about 3 x normal pressure). dad, X Ray, 1) (F. Worman, L, Larkins): , All H-4 radiatéteypssbiratian, che by suthurity of eeea moved into room B-142 for storage.,et card file bee 3 2okaied 6 , a permanent *\rercon avthorising change in classifi: ation) record will be kept on all of these to keep account of QE movements and locations. 2) By ( AO Shee ¢ r arrivals Shar (Date) LLP (Signature’of parson making the change, and date) Work has been started on the preparation of a ceric sulfate dosimeter to be used in the determination of high radiation dose levels, 3) Chest X rays have been taken on all of the monkeys to assist in the discovery of any possible tuberculosis in the colony. 4) A large number of exposures have been made on the Maxitron during the past months including animal studies, bacteria, ceric sulfate dosimetry and exposures of the ionization chambers prepared by Dr. Rossi. Total tube time to date amounts to 214 hours and 2582 exposures. .__Padiobiology Section (Payne S, Harris): sy 6) g ay 7 usinieci