Errata

XXIV. On the Illumination of Light-houses. By Lieut. Thomas Drummond of the Royal Engineers. Communicated by Lieut. Colonel Colby of the Royal Engineers, F.R.S. . . . . . . . . . . . . . . . . . page 383 XXV. On the electro-magnetic properties of metalliferous veins in the mines of Cornwall. By Robert Were Fox. Communicated by the President. 399 XXVI. Sequel to a paper on the tendency to Calculous Diseases, and on the Concretions to which such diseases give rise. By John Yelloly, M.D. F.R.S. . . . . . . . . . . . . . . . . . . . . . . . 415 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 429 Appendix. Presents received by the Royal Society, from Nov. 19th 1829 to June 17th 1830. Meteorological Journal, kept at the Apartments of the Royal Society, by order of the President and Council. ERRATA in Part I. Page 74, dele the last paragraph but one. — 142, in the second formula, line 4th, for φ, read 1. Part II. Page 260, last line, for fire read ice. — 282, line 8, for heated read luted.