MR &5 



PROCEEDINGS 



OF 



THE ROYAL SOCIETY. 

 Series B. Vol. 82. No. B 559. 



BIOLOGICAL SCIENCES. 



CONTENTS. 



Page 



CROON IAN LECTURE. — Alterations in the Development and Forms 

 of Plants as a Result of Environment. By Prof. G. KLEBS, University 

 of Heidelberg . . . , . 547 



The Origin and Destiny of Cholesterol in the Animal Organism. Part VII. — 

 On the Quantity of Cholesterol and Cholesterol Esters in the Blood of 

 Rabbits Fed on Diets containmg Varymg Amounts of Cholesterol. By 

 MARY T. ERASER, B.Sc. and J. A. GARDNER. M.A 559 



On the Comparative Toxicity of Theobromine and Caffeine, as Measured by 

 their Direct Effect upon the Contractility of Isolated Muscle. By 

 V. H. VELEY, F.R.S., and A. D. WALLER, M.D.. F.R.S 568 



A New Method for the Quantitative Estimation of Hydrocyanic Acid in 



Vegetable and Animal Tissues. By Dr. A. D. WALLER, F.R.S. . . 574 



The Origin of Osmotic Effects. III. — The Function of Hormones in 

 Stimulating Enzymic Change in Relation to Narcosis and the Phenomena 

 of Degenerative and Regenerative Change in Living Structures. By 

 HENRY E. ARMSTRONG, F.R.S., and E. FRANKLAND ARMSTRONG, 

 Ph.D., D.Sc 588 



The Inorganic Composition of the Blood in Vertebrates and Invertebrates, 

 and its Origin. By Prof. A. B. MACALLUM. Ph.D., Sc.D., F.R.S., of the 

 University of Toronto .......... 602 



The Anatomy and Morphology of the Leaves and Inflorescences of 



Welwitschia mirabilis. By Miss M. G. SYKES. (Abstract) . , . 625 



PRINTED FOR THE ROYAL SOCIETY AND SOLD BY 

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



Price Two Shillings and Sixpence. 



No. B 559- 



September 9, 1910. 



