PROCEEDINGS 



OF 



THE ROYAL SOCIETY. 



Series B. Vol. 85. No. B 577. 



BIOLOGICAL SCIENCES. 



CONTENTS. 



Page 



A Confusion-Test for Colour- Blindness. By GEORGE J. BURCH, M.A., 



p D.Sc. Oxon, F.R.S 8 1 



The Locomotor Function of the Lantern in Echinus, with Observations on other 

 Allied Lantern Activities. By J. F. GEMMILL, M.A.. M.D., D.Sc, F.Z.S., 

 Lecturer in Embryology, Glasgow University, and in Zoology, Training 

 College, Glasgow .......... 84 



Studies on Enzyme Action. XV. — Urease : a Selective Enzyme. By 



HENRY E. ARMSTRONG, F.R.S., and EDWARD HORTON . .109 



Certain Results of Drying Non-sporing Bacteria in a Charcoal Liquid Air 



Vacuum. By S. G. SHATTOCK, F.R.C.S., and L. S. DUDGEON, F.R.C.P. 127 



An Improved Method for Opsonic Index Estimations, involving the 

 Separation of Red and White Human Blood Corpuscles. By CHARLES 

 RUSS, M.B. Lond 138 



On a New Method of Examining Normal and Diseased Tissues by Means 

 of Intra-vitam Staining. By Prof. Dr. EDWIN GOLDMANN, University 

 of Freiburg, Baden . . . . . . . . . .146 



Antelope and their Relation to Trypanosomiasis. By Dr. H. L. DUKE. 



(Plate 2) 156 



printed for THE ROYAL SOCIETY and sold by 



HARRISON & SONS, 45, ST. MARTIN'S LANE, LONDON, W.C. 



Price Three Shillings. 



No. B 577. 



May 9, 1912. 



