PROCEEDINGS OF 

 THE ROYAL SOCIETY. 



VOL. XLIV. 



No. 267. 



CONTEXTS. 



April 19, 1888. 



PA GTS 



I. The Radio-Micrometer. By C. V. Boys, A.R.S.M 96 



II. On Hamilton's Numbers. Part II. By J. J. Sylvester, D.C.L., F.R.S., 

 Savilian Professor of G-eometry in the University of Oxford, and James 

 Hammond, M.A. Cantab. 99 



III. Hydraulic Problems on the Cross-sections of Pipes and Channels. By 



Heney Hennessy, F.R.S.. Professor of Applied Mathematics and 

 Mechanism in the Royal College of Science for Ireland. . . .101 



IV. On the Heating Effects of Electric Currents. No. III. By Vv. H. 



Peeece, F.R.S 109 



V. On the Compounds of Ammonia with Selenium Dioxide. By Sir 

 Chaeles A. Cameeon, V.P.I. C, F.R.C.S.I., and John Macallan, 



VI. On the Logarithmic Law of Atomic Weights. By Gr. Johnstone 



Stoney, M.A., D.Sc, F.E.S. 115 



r.i.c. 



112 



List of Presents 



117 



For continuation of Contents see U7i page of Wrapper. 



Price One Shilling and Sixpence. 



