on resigning office, 27 October, 1890. xxi 



By Sam. Hunter Christie, M.A. (Trin.) : On the laws according to which 

 masses of iron influence magnetic needles. Trans. I. 147 — 173. 



A letter from the Rev. J. Davis to the Rev. Dr Wood, containing some 

 further details respecting certain optical phenomena mentioned in the 

 Minutes of the Society's Meeting on the 17th of April. 



November 13, 1820. 



By Prof. E. D. Clarke : On a method of giving to common Paris Plaster casts 



the appearance of polished Rosso Antico. 

 By Professor Lee : On certain astronomical tables by Mohammed al Farsi, a 



MS. copy of which exists in the University Library. Trans. I. 249 — 265. 



November 27, 1820. 



By Prof. E. D. Clarke: On the discovery of native natron in Devonshire. 



Trans. I. 193—201. 

 By the same : Notice respecting the sarcophagus brought from Egypt by 



Mr Belzoni. 

 By Will. Cecil, M.A. (Magd.): On the application of hydrogen gas to produce 



a moving force in machinery, with the description of an engine where the 



moving force is produced on that principle. Trans. I. 217 — 239. 



December 11, 1820. 



A communication from Dr Wavell (Hon. Member), with some observations 

 by Dr E. D. Clarke on the decomposition of a quartzose rock, and on the 

 formation of natron. 



By Professor Haviland, Vice-President: On some unusual appearances pre- 

 sented by the stomach of a man who died of a fever. Trans. I. 287 — 

 290. 



By Professor Lee : A demonstration of the properties of parallel lines, by 

 Nasir el Din, translated from the Arabic. 



March 5, 1821. 



"Communications from Professor Leslie and Dr Wavell read by Dr E. D. 



Clarke." 

 By Fra. Lunn, B.A. (Joh.) : On the analysis of a native phosphate of copper. 



Trans. I. 203—207. 

 By Prof. E. D. Clarke : On the crystallization of water. Trans. I. 209—215. 



March 19, 1821. 



A communication (read by Professor Sedgwick) from Mr Ross respecting 



some minerals found at Buralston. 

 By Prof. E. D. Clarke : On Arragonite. 



April 2, 1821. 



By Joh. Leslie, Professor of Mathematics in the University of Edinburgh 



(Hon. Member) : On the effect of hydrogen gas on the propagation of 



sound. (Read by Professor Lee.) Trans. I. 267. 

 By Professor Cumming : Exhibition of experiments and communication read 



on the effects of the galvanic fluid on the magnetic needle. Trans. I. 



269—279. 

 By Professor Sedgwick : On the geology of the Lizard district. 



