PROCEEDINGS 



OF 



THE ROYAL SOCIETY. 

 Series B. Vol. 77. No. B 514. 



BIOLOGICAL SCIENCES. 



CONTENTS. 



Page 



The Effect of Plant Growth and of Manures upon the Retention of Bases by 



the Soil. By A. D. HALL, M.A., and N. H. J. MILLER, Ph.D. . . i 



On the Origin and Life History of the Interstitial Cells of the Ovary in the 



Rabbit. By JANET E. LANE-CLAYPON. (Plate 1) ... 32 



Fertility in Scottish Sheep. By FRANCIS H. A. MARSHALL, M.A. 



(Cantab.), D.Sc. (Edin.), Carnegie Fellow, University of Edinburgh . 58 



On the Nature of the Galvanotropic Irritability of Roots. By ALFRED J. 



EWART, D.Sc, Ph.D., F.L.S., and JESSIE S. BAYLISS, B.Sc. ... 63 



On the Isolation of the Infecting Organism (" Zoochlorella ") of Convoluta 

 roscoffensis. By FREDERICK KEEBLE, M.A., University College, 

 Reading, and F. W. GAMBLE, D.Sc, University of Manchester . . 66 



Further Observations on the Germination of the Seeds of the Castor Oil 

 Plant (Ricinus communis). By J. REYNOLDS GREEN, Sc.D., F.R.S.. 

 Professor of Botany to the Pharmaceutical Society of Great Britain, and 

 HENRY JACKSON, M.A., Fellow and Tutor of Downing College, 

 Cambridge ............ 69 



printed for THE ROYAL SOCIETY and sold by 



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



No. B 514. 



Price Three Shillings. 



November 30, 1905. 



