PROCEEDINGS 



OF 



THE ROYAL SOCIETY. 



Series B. Vol. 92. 



No. B 643. 



BIOLOGICAL SCIENCES. 



CONTENTS. 



Page 



Studies on Synapsis. III. — The Nuclear Organisation of the Germ Cells in 



Libellula depressa. By LANCELOT HOGBEN. (Plates 4-7) . . 60 



Cellular Immunity : Observations on Natural and Acquired Immunity to 



Cobra Venom. By J. A. GUNN and R. ST. A. HEATHCOTE . . 8r 



The Effect of Thyroid-feeding and of Thyro-parathyroidectomy upon the 

 Pituitrin Content of the Posterior Lobe of the Pituitary, the Cerebro- 

 spinal Fluid, and Blood. By P. T. HERRING . . ' . . .102 



On the Myogram of the Rexor-reflex evoked by a Single Break-shock, By 



K. SASSA and C. S. SHERRINGTON. Pres. R.S. 10& 



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No. B 643. 



February 1 , 1921. 



