INDEX. 
Sun, transits of — comparative observations of at Greenwich, Paris, 
Dublin, and Blackman-street, 445 et seq.— its longitude com- 
puted from Delambre’s and Carlini’s tables compared with 
observation, 481 — its right ascension observed and computed, 
discordances of, 423. 
Suspension bridges , Mr. Gilbert on their mathematical theory, 
202 . 
Swedish arc of the meridian, its accuracy considered, 571 — em- 
ployed by Mr. Airy in determining the earth’s figure, 570. 
T 
Tables for facilitating construction of suspension bridges, and for 
the laying down of catenaries, 212. 
■ ■ ■ — of mortality and decrement of life, by Dr. Young, 290. 
— of the sun, by Carlini and Delambre, compared with 
observation, 481. 
Terebella conchilega, its habits and mode of burrowing, 345. 
Teredo , causes of its extinction in Britain, 358. 
Tension bars, as applied by Troughton to a transit instrument 
described, 425. 
Toad, common, Dr. J. Davy on, 127 — pores in its skin of two 
kinds, 130— anatomy of, 129. 
Transit instrument of Cambridge observatory, 75. 
________ seven feet, Mr. South’s description of a, 423. 
— — - - — — - — effect of its exposure to sun’s rays, 435. 
Tumour , aneurismal, coagulation of blood in, 189. 
V 
Vaccination, its effect on the average duration of life, 281. 
Vaporization, Mr. Faraday on the existence of a limit to, 484. 
Variation of the needle at Port Bowen, Part IY. 73 — diurnal 
changes of under a reduced directive power, 129. 
Vibrations of a needle diminished by sunshine, 219. 
Violet solar rays, their power to produce north polarity in steel, 134 
W 
Wardrop, J. Esq. his account of the case of a lady born blind 
who received sight at an advanced age by the formation of an 
artificial pupil, 529. 
Water, Mr. Perkins on compressibility of, 544. 
Weights and Measures, Capt. Eater’s account of their adjust- 
ment, 1. 
