on resigning office, 27 October, 1890. xlv 



May 4, 1840. 

 By Phil. Kelland, M.A. (Qu.) : On the Law of molecular attraction. 



May 18, 1840. 



By Dav. Tho. Ansted, M.A. (Jes.): On the Green Sandstone formation of 



Blackdown, Devon. 

 By Professor Miller : On the structure of the Heliotropes of Gauss, Steinheil, 



and Schumacher. 



June 1, 1840. 



By Will. Hopkins, M.A. (Pet.) : On certain geological phenomena of elevation, 

 and their connection with the formation of volcanoes. Phil. Mag. 1840, 

 ii. 154. 



November 16, 1840. 

 By Roderick Impey Murchison : On the geology of Russia. 

 By Geo. Biddell Airy, M.A. (Trin.) : On an optical fact, and its explanation 

 on the undulatory theory. 



November 30, 1840. 

 By Professor Henslow : On the diseases of wheat. 



December 14, 1840. 



By Aug. De Morgan, B.A. (Trin.) : On the composition of forces. 

 By Professor Whewell : On the equilibrium of oblique arches. 



February 22, 1841. 



By Professor Whewell : Additional remarks on oblique arches. 

 By the same : Is all matter heavy 1 Trans, vn. 197 — 207. 



March 8, 1841. 



By Joh. Tozer, M.A. (Gonv. and Cai.) : On some mathematical formula) for 

 determining the permanent effects of emigration and immigration on 

 numbers. Phil. Mag. 1841, i. 318. 



March 22, 1841. 



By Professor Miller : On supernumerary rainbows. Trans, vn. 277 — 286. 



April 26, 1841. 



By Professor Challis : On the resistance of air to a pendulum with a spherical 

 bob. Trans, vn. 333—353. 



May 10, 1841. 



By Professor Willis : On the arrangement of the joints of crustaceous 



animals. 

 By the same : On the original nomenclature of Gothic mouldings. 



May 24, 1841. 

 By Professor Challis : On a new kind of interference of light. 



November 15, 1841. 



By Professor Sedgwick : An account of the comparative classification of the 

 older strata in the British Isles, 



