PROCEEDINGS 



OF 



THE ROYAL SOCIETY. 



Series B. Vol. 78. No. B 522. 



BIOLOGICAL SCIENCES. 



CONTENTS. 



Page 



The Microscopic Changes in the Nervous System in a Case of Chronic 

 Dourine or Mai de Coit, and Comparison of the Same with those Found 

 in Sleeping Sickness. By F. W. MOTT, M.D., F.R.S. (Plates 1-4) . I 



On the Physiological Action of a Recently-Discovered African Arrow 

 Poison. By CHARLES BOLTON, M.D., Assistant Physician to 

 University College Hospital . . . . . . . . 13 



On the Origin of the Sertoli or Foot-cells of the Testis. By C. E. WALKER, 

 Assistant- Director of Cancer Research Laboratories, University of 

 Liverpool, and ALICE L. EMBLETON, B.Sc. (Plates 5 and 6) . . 50 



Observations on the Life-History of Leucocytes. By C. E. WALKER, 

 Assistant- Director of Cancer Research Laboratories, University of 

 Liverpool. (Plates 7-10) . . . 53 



The Action on Bacteria of Electrical Discharges of High Potential and 

 Rapid Frequency. By ALEXANDER G. R. FOULERTON, F.R.C.S., 

 and ALEXANDER M. KELLAS, Ph.D. .... .60 



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