PROCEEDINGS 



OF 



THE ROYAL SOCIETY. 



Series B. Vol. 89. No. B 621. 



BIOLOGICAL SCIENCES. 



CONTENTS. 



Page 



Some Effects of Organic Growth-Promoting Substances (Auximones) on 

 the Growth of Lemna minor in Mineral Culture Solutions. By 

 W. B. BOTTOM LEY, M.A., Professor of Botany, University of London, 

 King's College. (Plates 21 and 22) 481 



Some Effects of Organic Growth-Promoting Substances (Auximones) on the 

 Soil Organisms concerned in the Nitrogen Cycle. By FLORENCE A. 

 MOCKERIDGE, B.Sc, King's College, London 508 



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No. B 621. 



June 1, 1917. 



