xxvi Address of Mr J. W. Clark, President, 



May 24, 1824. 



By Professor Haviland, President : On the cases of secondary smallpox, and of 

 smallpox after vaccination, which have occurred in Cambridge during the 

 last year. 



By Professor Farish: On a method of obviating the inconveniences arising 

 from the expansion and contraction of the iron in iron bridges. 



November 15, 1824. 



By Professor Cumming : On the use of gold leaf in the detection of galvanism. 

 By Will. Whewell, M.A. (Trin.) : On the principles of dynamics. 



November 29, 1824. 

 By Professor Cumming : On the history of electro-magnetism. 



December 13, 1824. 



By Professor Farish : On the construction of the cogs of wheels. 



Professor Farish likewise exhibited to the Society the action of wheels in 

 the form of involutes of circles upon each other as an illustration of 

 the subject of his paper. 



February 21, 1825. 



By Professor Cumming : On the conversion of iron into plumbago by the 



action of sea- water. Trans, n. 441 — 443. 

 By Geo. Biddell Airy, B.A. (Trin.) : On a peculiar defect of his eyes producing 



distortion of images, and on the means of correcting it. Trans, n. 267 — 



271. 

 By Professor Sedgwick: On the essential distinction between alluvial and 



diluvial deposits. Annals of Philosophy, x. 1825, pp. 18 — 37. 



March 7, 1825. 



By Will. Whewell, M.A. (Trin.) : On a general method of converting rectilineal 



figures into others which are equivalent, such as squares, etc. 

 By Professor Sedgwick : On alluvial and diluvial deposits (continued). 



March 21, 1825. 



By Jos. Power, M.A. (Cla.) : A general demonstration of the principle of 

 virtual velocities. Trans, n. 273 — 276. 



April 18, 1825. 

 By Professor Farish : On the construction of the cogs of wheels (concluded). 



May 2, 1825. 



By Geo. Biddell Airy, B.A. (Trin.) : On the generation of curves by the 

 rolling of one curve upon another, and on the formation of the curves of 

 the teeth of wheels which may work in each other with perfect uniformity 

 of action. Trails, n. 277 — 286. 



By Professor Sedgwick : A portion of a paper on the geology of the Yorkshire 

 coast, a section of which was exhibited to the Society. 



By Will. Whewell, M.A. (Trin.): Exhibition of drawings of the appearances 

 ■ presented by the spokes of wheels in motion when seen through parallel 

 bars, and which consist of a series of quadratures. 



