The Support of Research in Medical and Allied Fields for the Period 1946 through 1951.

Technical Papers Some Applications of the Rapid Uptake of Vitamin B12 by Resting Lactobacillus leschmannii Organisms: Robert L. Davis and Bacon F. Chow 351 On the Interaction of Mesons and Plural vs. Multiple Meson Production: Alexander W. Stern ~ _ _ 352 A Rapid Titrimetric Method for Determining the Water Content of Animal Tissues: Sherburne F. Cook, Carl F. Cramer, and Keith Kenyon__._ 353 4 Bone Implantation as a Means of Studying Vitamin D Action: B. B. Migicovsky and A. M. Nielson _ 354 The Critical Frequency of Taste: Margaret Hubbard Jones and F. Nowell Jones _ 355 Skeletal Units in Protein Crystals: Dorothy Wrinch 356 An Inhibitor of Desoxyribonuclease in Human White Blood Cells and Bone Marrow Cells and its Relationship to Cellular Maturity: Henry H. Henstell and Robert I. Freedman _ 357 Action of Chymotrypsin a and Chymotrypsin B upon Several Protein Substrates: John A. Ambrose and M. Laskowski _ 358 Comments and Communications Richard B. Johnson, C. Edmund Marshall, G. Nahas, and Joseph Y. Peary X 360 Book Reviews Combustion, Flames and Explosions of Gases; Igneous and' Metamorphic Petrology; Smithsonian Meteorological T#ables 363 A Century of Geography 3 Meetings & Conferences 12