PROCEEDINGS 



OF 



THE ROYAL SOCIETY. 



Series B. Vol. 89. No. B 610. 



BIOLOGICAL SCIENCES. 



CONTENTS. 



Page 



The Transmission of Infra-red Rays by the Media of the Eye and the 

 Transmission of Radiant Energy by Crookes and other Glasses. By 

 H. HARTRIDGE, M.A., M.B.. B.C., Fellow of King's College, Cambridge, 



and A. V. HILL, MA., Fellow of Trinity College 58 



Soil Protozoa and Soil Bacteria. By EDWARD JOHN RUSSELL 



(Rothamsted Experimental Station) ....... 7^ 



The Chromosome Cycle in Coccidia and Gregarines. By CLIFFORD 



DOBELL and A. PRINGLE JAMESON 83 



Experiments on the Restoration of Paralysed Muscles by Means of Nerve 

 Anastomosis. Part III. — Anastomosis of the Brachial Plexus, with a 

 Consideration of the Distribution of its Roots. By ROBERT KENNEDY, 

 MA., D.Sc, M.D., St. Mungo Professor of Surgery in the University of 



Glasgow. (Abstract) 94 



The Development of the Thymus, Epithelial Bodies, and Thyroid, in the 

 Marsupialia. Part I. — Trichosurus vulpecula. By ELIZABETH A. 

 FRASER, B.Sc. (Lond.).and Prof. J. P. HILL, F.R.S. (Abstract) . - 97 



The Development of the Thymus, Epithelial Bodies, and Thyroid in the 

 Marsupialia. Part II. — Phascolarctos, Phascolomys and Perameles. By 

 ELIZABETH A. FRASER, B.Sc. (Abstract) 100 



A Bacterial Test for Plant Food Accessories (Auximones). By W. B. 

 BOTTOMLEY, M.A., Professor of Botany, University of London, King's 

 College 102 



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No. B 610. 



August 2, 1915. 



