200 INDEX. 



Toad, the common, account of the venom of, v. 127 



instance of one found in a solid rock, xv. 3S6 



Todd (Dr.), observations of, on the torpedo, i. 116 



• on the process of the reproduction of members of the 



aquatic salamander, xvi. 84 

 inquiry into the nature of the luminous power of some of 



the lampyrides, xvii. 269 

 — ■ (Rev. Mr.), inaccuracies of, in his edition of Johnson's 



Dictionary pointed out, x. 284 



Toddalia, a substitute for Peruvian bark, vii. 193 



Tombs (ancient), discovered, vi. 177 



■ (Celtic), near Cambridge, notice of, vii. 195 '; 



Tongue, instance of its being swallowed, iii. 182 



irritability of, xv. 385 



Tonquin bean, benzoic acid found in, x. 173 



Tooth-ach, cause of, ii. 17 



Topaz of Saxony, analysis of, xii. 266 



Torpedo, observations on, i. 116 



experiments on, iii. 129 



Torricellian tube, on the alteration in the bulk of successive por- 

 tions of air introduced into, xx. 378 



Torture used in China, vii. 341 



Touch, organ of, adapted to its peculiar functions, ii. 6. Rete- 

 mucosum, the seat of, 9 



. ■ notions of magnitude and distance, how far acquired from, 



iii. 3 



Touchstone, analytical examination of, xv. 315 



. wood, observations on, xvi. 185 



Tourmaline pyro-electricity of, vii. 397 



' ■ remarkable dichroism of, xiii. 219 



Tournefort, botanical discoveries of, x. 53 



Traill's (Dr. T. S.) description of coal recently discovered in 

 Mexico, xix. 27 



Transitions among rocks, remarks on, xix. 212 



Transit instrument, observation on stars with, viii. 84 



put up at the Cambridge observatory account of, xix, 23S 



