Vlil 
CONTENTS. 
NUMBER CVL— SUPPLEMENT TO VOL. XVL 
Page 
Prof. Poggendorlf on Galvanic Circuits composed of two 
Fluids, and of two Metals not in contact (^concluded) 537 
Prof. J. Henry’s Contributions to Electricity and Magnetism. 
No. III. On Electro-dynamic Induction 551 
Mr. Lubbock on the Heat of Vapours, and on Astronomical 
Refractions (^continued) 562 
Dr. C. Schaf haeutl on the Combinations of Carbon with Sili- 
con and Iron, and other Metals, forming the different species 
of Cast Iron, Steel, and Malleable Iron {concluded) 570 
Proceedings of the Royal Society 590 
Index 601 
PLATES. 
I. Illustrative of Mr. W. Snow Harris’s Second Paper on Lightning Con- 
ductors. 
II. and III. Illustrative of Mr. Griffith’s Paper on the Geology of Kil- 
larney. 
IV. Illustrative of Dr. Roget’s Paper on the Problem of the Knight’s 
Move at Chess. 
V. Illustrative of Mr. Lubbock’s Memoir on the Heat of Vapours, and 
on Astronomical Refractions. 
VI. Illustrative of Dr. Draper’s Paper on the Electro-motive Power 
of Heat. 
VII. Illustrative of Mr. Smee’s Paper on the Production of Electrotypes. 
ERRATA. 
Vol. xii. p. 608, line 2 from the bottom, /or Manhand, read Marchand. 
Vol. XV. p. 451, last line but three, /or increasing indefinitely, read in- 
creasing or diminishing indefinitely. ^ 
p. 452, line 14, /or cos mi= V — !• sin m i, read cos m i -f- V— 1. 
sin m i. 
p. 453, line ^S,for p,a, read p, a,. 
, line 2\),for a, read a,. 
■ p. 454, line 21, /or (23.), read (33.) 
— . lines 22 and 9^Z,for o read e 
Vol. xvi., p. 32, line 15 from the bottom, for l-2554th, ro«c? l-3554th. 
p. 108 line 19 from the bottom, /or Haller, read Harvey. 
p. 478, line 2, for M.R.S. read M.R.L 
