on resigning office, 27 October, 1890. xxiii 



By Joh. Stevens Henslow, M.A. (Joh.) : On the geology of the Isle of Anglesea 

 (concluded). Trans. I. 359—452. 



March 11, 1822. 



The President proposed that, in consequence of the death of the Vice- 

 President of the Society, Prof. E. D. Clarke, the meeting should be adjourned 

 without proceeding to the regular business of the evening. This proposition 

 was agreed to unanimously, and the Society adjourned immediately. 



March 25, 1822. 



By Will. Mandell, B.D. (Qu.) : A description of a new self-regulating lamp. 



By Mr H. B. Leeson : A description of a safety apparatus to the hydrostatic 

 blowpipe of Tofts, by which it may be converted into an oxyhydrogen 

 blowpipe without danger to the operator. (Read by Mr Peacock.) A 

 model of the safety apparatus, and of the blowpipe, was exhibited to the 

 Society and explained by Mr Leeson. 



By Geo. Biddell Airy, student of Trinity College: On the alteration of the 

 focal length of a telescope by a variation of the velocity of light and of 

 the observations to which the change may give rise. (Read by Mr 

 Peacock.) 



April 22, 1822. 



By David Brewster, LL.D., Honorary Member of this Society: On the differ- 

 ence of optical structure between the Brazilian topazes and those of 

 Scotland and New Holland. Trans, n. 1 — 9. 



May 6, 1822. 



By Will. Whewell, M.A. (Trin.) : On the rotation of bodies. Trans. n. 11 — 



20. 

 By Dav. Brewster (Hon. Member): On the distribution of the colouring 



matter, and on certain peculiarities in the structure and optical properties 



of the Brazilian topaz. Trans, n. 1 — 9. 



May 21, 1822. 



By Professor Sedgwick : On the basaltic dykes in the county of Durham, and 

 the great basaltic formation in Teesdale. Trans. II. 21 — 44. 



November 11, 1822. 



By Will. Whewell, M.A. (Trin.) : On the oscillations of a chain suspended 



vertically, and on the oscillations of a weight drawn up uniformly by a 



string. 

 By Fra. Gybbon Spilsbury: On a peculiar relation existing between gravity 



and the production of magnetism in galvanic combinations. (Read by 



Mr Henslow.) Trans, n. 77—83. 



November 25, 1822. 



By Geo. Biddell Airy, Scholar of Trin. Coll. : On the construction of achro- 

 matic reflecting telescopes with silvered lenses in the place of metallic 

 mirrors. Read by Mr Peacock. Trans, n. 105 — 118. 



December 9, 1822. 



By Will. Cecil, M.A. (Magd.) : On an apparatus for grinding telescopic mirrors 

 and object-lenses. Trans, n. 85 — 103. 



