CONTENTS 
OF YOL. 172. 
PART I. 
I. On the Structure and Development of the Skull in the Batrachia .—Part III. By 
William Kitchen Parker, F.R.S. .page 1 
PART II. 
II. The Cochlea of the Ornithorhynchus platypus compared with that of ordinary 
Mammals and of Birds. By Urban Pritchard, M.D., F.R.C.S., Aural 
Surgeon to King’s College Hospital. Communicated by Professor Huxley, 
Sec.R.S . 267 
III. On the Organization of the Fossd Plants of the Coed-Measures. —Part XI. By 
W. C. Williamson, F.R.S., Professor of Botany in the Victoria University 
(Oioens College , Manchester) . 283 
IY. On the Induction of Electric Currents in Infinite Plates and Spherical Shells. 
By C. Niven, M.A., Professor of Natured Philosophy in the University of 
Aberdeen. Communicated by J. W. L. Glaisher, 31.A., F.R.S. . . . 307 
Y. Electrostatic Capacity of Glass, II., and of Liquids. By J. Hopkinson, 31.A., 
D.Sc., F.R.S . 355 
YI. On the Forty-eight Coordinates of a Cubic Curve in Space. By William 
Spottiswoode, P.R.S . 375 
A a 
