Prevention of deep vein thrombosis.

When is Dementia Presenile? J. A. Snowdon, M.R.A.C.P.; P. K. Bridges, M.D., D.P.M ............................. 465 Research in Psychiatry C. P. B. Brook, D.P.M.; A. Tarnopolsky, M.D. 465 Speaking Valve for Alttachment to a Tracheostomy Tube F. M. Emery, F.F.A. R.C.S ................. 466 Effect of Intravenous Infusion of Acetylsalicylic Acid on Renal Function M. Robert, and others .................. 466 New Electronic Metal Locator D. Gordon, M.B., D.M.R.D ................. 467 Prevention of Deep Vein Thrombosis A. 0. H. Tellegen, M.D.; V. C. Roberts, PH.D., and others ........................ 467 Parathyroid Hormone Production and Malignancy M. W. Salah, F.R.C.S ..................... 467 Tuberculosis Chemotherapy P. Vaitl, M.D ........................... 468 Methyldopa Metabolism and Barbiturates A. Kaldor, M.D., and others .............. 468 Antibacterial Effect of Different Dialysates J. A. Richardson, M.D., and K. A. Borchardt, PH.D. ................................ 468 Sir Paul Chambers's Inquiry M. J. Illingworth, M.B.; A. A. Gildersleve, M.B.; J. S. Watkins, M.R.C.P ............... 469 G.M.C. Disciplinary Committee D. C. M. Smith, M.B ..................... 470 G.M.C. Retention Fee and Erasure F. G. Ince, M.B., and others .............. 470 G.M.C. Accounting M. O'Donnell, M.B.; D. A. Cahal, M.D.....470