PROCEEDINGS 



OF 



THE ROYAL SOCIETY. 

 Series B. Vol. 90, No. B 633. 



BIOLOGICAL SCIENCES. 



CONTENTS. 



Page 



On the Four Visible Ingredients in Banded Bituminous Coal : Studies in the 

 Composition of Coal, No. 1. By MARIE C. STORES, D.Sc, Ph.D., 

 Fellow and Lecturer in Palasobotany, University College, London. 

 (Plates 1 1 and 1 2) 47© 



The Comparative Rate of Absorption of Various Salts by Plant Tissue. 

 By WALTER STILES, M.A., Lecturer in Botany in the University of 

 Leeds, and FRANKLIN KIDD. M.A., D.Sc, FeWovf of St. John's College, 

 Cambridge ........... 487 



Changes in the Teeth of the Guinea-pig, produced by a Scorbutic Diet. 

 By S. S. ZILVA, Ph.D., M.Sc, and F. M. WELLS, Major, C.A.D.C. 

 (Plate 13) 505 



On a New Factor in the Mechanism of Bacterial Infection. By 



W. E. BULLOCK and W. CRAMER S»3 



PRINTED AND PUBLISHED FOR THE ROYAL SOCIETY BY 

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 Price Four Shillings and Sixpence. 



No. B 633. 



May 15, 1919. 



