408 ENDER. 
Time, indicated by any number of chronometers, an easy method 
of comparing, with the given time at a certain station, 316, 316. 
Titanium (Metallic), on the appa ent magnetism of, 129 
Todd (Dr.) inquiry into the nature of the luminous power of some 
of the lampyrides, 269, 270 
Tredgold (Mr.) analysis of his work on the strength of cast iron 
and other metals, 150, 151. Account of his experiments on 
the elasticity of hard and soft steel, 267, 268 
Unio Gigas, a new species of fresh-water-shell, description of, 
15—17 . 
Univalves, remarks on, 272, 273 
Uranium, preparation of the oxide of, 139, 140—382. Notice 
of uranium pyrophori, 383 
Variation, daily, of the horizontal and dipping-needle, under a 
reduced directive power, 128 
Vauquelin (M.) experiments of, on the acetates of copper, 383 
Vegetation, table of, at different heights, 176 
Velocity of sound, experiments on, 266 
Verdigris, observations on, 384 © 
Vesuvius, notice of new minerals found in, 180 
Vicat (M.) experiments of, on the burning of limestone, 361—363 
Violine, notice of a new vegeto-alkaline, 385, 386 
Vision, on the indistinctness of, in optical instruments, and re- 
medies‘for it, 17—28, 202—209 
Voltaic Troughs of Dr. Hare, notice of, 378 
Volute, characters of several new shells belonging to the order of, 
31—38 
Walker (Mr.) syllabus of his lectures on plane geometry, 285 
Walrus, new fact in the natural history of, 262 
Ware (Samuel, Esq.) design by, for making a public road under 
the Thames, with observations, 62—69 — 
Weill, overflowing, at Chiswick, account of, 70—74 — 
Wollaston (Dr. W. H.) observation of, on the apparent magnetism 
of metallic titanium, 129. On semi-decussation of the optic 
nerves, 259—261. On the apparent direction of the eyes in a 
portrait, 274—276 
Young (Dr. Thomas) a finite and exact expression by, for the 
refraction of an atmosphere nearly resembling the earth, 255. 
Printed by WILLIAM CLOWES 
Northumberland-court. 
