PROCEEDINGS OF 

 THE EOYAL SOCIETY. 



vol. xxi. No. 142. 



CONTENTS. X 



February 6, 1873. 



PAGE 



I. On the Osteology of the Hyopotamidce. By Dr. W. Kowaleysky . . . 147 

 II. Magnetic Survey of Belgium in 1871. By the Eev. S. J. Perry .... 165 



February 13, 1873. 



I. On Curvature and Orthogonal Surfaces. By A. Cayley, F.E.S., Sadlerian 



Professor of Mathematics in the University of Cambridge 1(36 



II.* On a new Eelation between Heat and Electricity. By Fredeeick 



GrUTHEIE, F.E.S. Iflfc 



February 20, 1873. 



I. On the Anatomy and Histology of the Land-Planarians of Ceylon, with some 

 Account of their Habits, and a Description of two new Species, and with 

 Notes on the Anatomy of some European Aquatic Species. By H. N. 

 Moseley, M.A., Exeter College. Oxford 169 



II. On a new Locality of Amblygonite, and on Montebrasite, a new Hydrated 



Aluminium and Lithium Phosphate. By A. O. Des Cloizeatjx . . . 174 



[For continuation of Contents see Uh page of Wrapper. ~] 



