on resigning office, 27 October, 1890. xxxiii 



May 24, 1830. 



By Professor Airy : On the peculiar form of the rings produced by a ray circu- 

 larly polarized, and on the calculation of the intensity of light belonging 

 to this and other cases. 



By Will. Webster Fisher (Down.) : On the appendages to organs as provi- 

 sionary to the modifications of the functions. 



By Bob. Murphy, B.A. (Gonv. and Cai.) : On the general properties of definite 

 integrals, and on the equation of Biccati. Trans, ill. 429 — 443. 



By Hen. Coddington, M.A. (Trin.) : A further explanation of his microscope. 



After the meeting Mr Willis exhibited and explained an instrument for 

 making orthographical projections of objects. 



November 15, 1830. 



By Aug. De Morgan, B.A. (Trin.), Professor of Mathematics in London 

 University : On the Equation of Curves of the second degree. Trans, iv. 

 71—78. 



By Will. Okes, M.A. (Gonv. and Cai.) : On the Wourali poison used by the 

 Maconshi Indians ; a blow -pipe, quiver, and arrows were exhibited. 



By Professor Cumming : A communication from Mr Edwards on a substance 

 resembling cannel coal, found in digging a canal near Norwich. 



By Bi. Tho. Lowe, B.A. (Chr.) : On the Natural History of Madeira. 



After the meeting Professor Whewell gave an account of a method of con- 

 structing cross vaults without boarded centering, revived and described 

 by M. de Lassaulx of Coblentz. 



November 29, 1830. 



By Ri. Tho. Lowe, B.A. (Chr.): On the Natural History of Madeira (con- 

 cluded). Trans, iv. 1 — 70. 



By Professor Whewell : Rules for the selection and employment of symbols of 

 mathematical quantity. 



After the meeting Mr Leonard Jenyns gave an account, illustrated by draw- 

 ings, of the quinary system of Natural History proposed by Mr M c Leay. 



December 13, 1830. 



By Professor Whewell : Rules for the selection, etc. (concluded). 



By Professor Henslow : On the mode of reproduction of the Chara. 



After the meeting Professor Henslow made some observations on tall ferns, 

 exhibiting a specimen of a stalk. 



A machine was exhibited invented by Professor Airy for the purpose of ex- 

 hibiting the mode of propagation of undulations along a line of particles. 



February 21, 1831. 



By Professor Airy : On the nature of the two rays formed by the double 

 refraction of quartz. Trans, iv. 79 — 123. 



After the meeting Professor Airy exhibited a machine for illustrating the 

 nature of the undulations supposed in circular polarization ; an instru- 

 ment for exhibiting the rings, spirals, etc. produced by double refraction ; 

 and an instrument for exhibiting the same phenomena by means of the 

 light produced by the combustion of lime in oxygen. 



March 7, 1831. 



By Rob. Murphy, B.A. (Gonv. and Cai.) : On the general solution of equa- 

 tions. Trans, iv. 125 — 153. 



VOL. VII. FT. IV. C 



