CONTENTS {continued). 



March 18, 1880. 



PA&E 



I. On the Structure of the Immature Ovarian Ovum in the common Fowl 

 and in the Rabbit. 9 To which is appended some Observations upon the 

 Mode of Formation of the Discus Proligerus in the Rabbit, and of the 

 Ovarial Grlands or " Egg-tubes " in the Dog. By E. A. Schafer, 

 F.R.S. (Plates 2, 3, 4) 237 



II. Researches into the Colouring Matters of Human Urine, with an Account 



of the Separation of Urobilin. By C. A. MacMttnn, B.A., M.D. . 250 



III. On the Coalescence of Amoeboid Cells into Plasmodia, and on the so- 



called Coagulation of Invertebrate Fluids. By P. G-eddes (Plate 5) . 252 



IV, . On the Analytical Expressions which give the History of a Fluid Planet 



of small Viscosity, attended by a Single Satellite. By G-. H. Darwin, 

 F.R.S , . . . . .255 



V. On the Modifications of the Spectrum of Potassium which are Effected 

 by the Presence of Phosphoric Acid, and on the Inorganic Bases and 

 Salts which are found in combination with Educts of the Brain. By 

 J. L. W. Thudichum, M.D., F.R.C.P.L 278 



VI. On Magnetic Circuits in Dynamo- and Magneto-Electric Machines. 



3STo. 2. By Lord Elphinstone and Charles W. Vincent, F.R.S. E., 

 F.C.S., F.I.C ... 287 



VII. Some further Observations on the Influence of Electric Light upon 



Vegetation. By C. William Siemens, D.C.L., LL.D., F.R.S. . . 293 



List of Presents ............ 295 



CATALOGUE OF SCIENTIFIC PAPERS, COMPILED BY THE ROYAL 



SOCIETY. 



Published by Her Majesty's Stationery Office. 

 8 vols., 4to. 1800—1873. Per vol. : 20s., cloth ; 28s., half -morocco. 

 On Sale by Murray, Albemarle Street, and Trtibner and Co., Ludgate Hill. 



HARRISON AND SONS, 45 & 46, ST. MARTIN'S LANE, W.C., 



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