The status and development of biophysics.

Technical Papers The Physiologic Limits of Vision: ElizabethW.Olmsted and El zabeth P. Olmsted ................................................ 176 Intracellular Localization and Distribution of Carbonic Anhydrase in Plants: E.R.Waygood and K A. Clendenning ......................... ....................... 177 Animal Protein Factor in Crude Casein and its Vitamin B12 Relationships: M. Piccioni, A. Rabbi, and G. Moruzzi ............................................... 179 A Micro Ball Mill for the Disintegration of Bacteria: Carl-Goran Heden ............. ..................................... 181 The Purine and Pyrimidine Content of Three Strains of Escherichia coli: A. Marshak ............... ................................... 181 A Simplified Technique for Microelectrocoagulation: Mychyle 'W. Johnson and L. J. Manhoff, Jr .................................................. 182 Glycogen Storage in the Heart in Experimental Renal Hypertension in the Rat: Robert W. Lackey .......................................... 184 The Direction of Flow in Blood Vessels of the Infundibular Stalk: R. J. Barrnett and B. 0. Greep .................................... 185 A Universal Line Graph for Estimating Percentage Potency in Multidose Assays: Marion B. Sherwood .................................... 185 Potassium Excretion i Rats: S. E. Dicker ............................................... 187 Silver Nitrate as a Test for Ortho and Para Dihydric Phenols: Bernard S. WTildi . ................................................. 188