PROCEEDINGS 



OF 



THE ROYAL SOCIETY. 



Series B. Vol. 89. 



No. B 622. 



BIOLOGICAL SCIENCES. 



CONTENTS. 



On the Causes Responsible for the Developmental Progress of the Mammary 

 Glands in the Rabbit during the Latter Part of Pregnancy. By 

 J. HAMMOND, M.A.. Captain, Norfolk Regiment. (Plate 23) 



On the Post-CEstrous Changes occurring in the Generative Organs and 

 Mammary Glands of the Non-Pregnant Dog. By F. H. A. MARSHALL, 

 Sc.D„ and E. T. HALNAN, M.A., 2nd Lieut., R.F.A. (Plates 24-26) . 



CROONIAN LECTURE.— Upon the Motion of the Mammalian Heart. 

 By THOMAS LEWIS . . . 



On the Influence of Vibrations upon the Form of Certain Sponge-Spicules. 

 By ARTHUR DENDY, D.Sc, F.R.S., Professor of Zoology, and 

 J. W. NICHOLSON, M.A., D.Sc, F.R.S., Professor of Mathematics, in 

 the University of London (King's College) ...... 



Index 



Title, Contents, etc. 



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



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Price Five Shillings and Sixpence. 



No. B 622. 



August 1, 1917. 



