CONTENTS 



VII 



87 Effect of Irradiation with X-Rays on the Catabolism of Ethylalcohol 



in the Mouse 847 



88 Radioactive Tracers in Radiobiological Studies. The Thirty-Sixth 



Silvanus Thompson Memorial Lecture 851 



Botanical Studies 



89 The Absorption and Translocation of Lead by Plants 876 



90 Atomic Dynamics of Plant Growth (with K. Linderstrem-Lang and 



C. Olsen) 884 



91 Exchange of Phosphorus Atoms in Plants and Seeds (with K. Linder- 



str0m-Lang and C. Olsen) 887 



92 Interaction Between the Phosphorus Atoms of the Wheat Seedling 



and the Nutrient Solution 89 1 



93 Exchange of Nitrogen Atoms in the Leaves of the Sunflower (with 



K. Linderstrem-Lang, A. S. Keston and C. Olsen) 905 



94 Zinc Uptake by Neurospora (with I. Andersson-Kotto) 910 



95 Ph osphorus Exchange in Yeast (with K. Linderstrom-Lang and N. Niel- 

 sen) 916 



96 Potassium Interchange in Yeast Cells (with N. Nielsen) 918 



97 Note on the Number of Pollen Grains Identified in the Fruit of the 



Aspen (with C. Eklundh-Ehrenberg and H. Euler) 924 



Lectures 



98 Some Applications of Isotopic Indicators. Nobel Lecture 928 



99 The Application of Radioactive Indicators in Biochemistry. Faraday 



Lecture 961 



100 Historical Progress of the Isotopic Methodology and its Influences 

 on the Biological Sciences. Read at the Turin Meeting of the 

 Society of Nuclear Medicine 997 



Index 1039 



