Contents. 



January 27, 1890. 



On Non-Euclidian Geometry. By Professor Cayley .... 35 

 On a Scheme of the Simultaneous Motions of a system of Rigidly con- 

 nected Points, and the Curvatures of their Trajectories.- By J. 

 Larmor 36 



February 10, 1890. 



On the perceptions and modes of feeding of fishes. By W. Bateson . 42 



Notes on Lomatophloios macrolepidotus {Goldg.). By A. C. Seward . 43 

 On the origin of the embryos in the ovicells of Cyclostomatous Polyzoa. 



By S. F. Harmer 48 



February 24, 1890. 



On vehicles vised by the old Masters in Painting. Part I. A. P. Laurie 48 

 On the Action of the Copper Zinc Couple on dilute solutions of Nitrates 



and Nitrites, NaHO and KHO being absent. By James Monckman 52 



On certain Points specially related to Families of Curves. By J. Brill . 57 



March 10, 1890. 



On the germination of Acacia sphaerocephala. By W. Gardiner . . 65 

 Additional note on the thickening of the stem in the Cucurbitacece. By 



M. C. Potter 65 



Note on the action of Bennin and Fibrin-ferment. By A. S. Lea and 



W. L. Dickinson . . ... . . . . . .67 



On some Skulls of Egyptian Mummied Cats. By W. Bateson . . 68 



April 28, 1890. 



On the series in which the exponents of the powers are the pentagonal 



numbers. By Dr Glaisher 69 



On the Influence of Electrification on Ripples. By J. Larmor . . 69 

 On Sir William Thomson's estimate of the Rigidity of the Earth. By 



A. E. H. Love . . . .72 



