208 INDEX. 



Villa (Roman), discovered in Oxfordshire, v. 150. vi. 175 



VjNCE (Professor) opinion of, to account for the apparent changes 

 of place, colour, size, and figure of the heavenly bodies, x. 

 14. Observations thereon, 15. Theory to account for such 

 changes, 16 



Vincent (St.), island of, its geological structure, v. 315 



Vin despoulesj recipe for making, iii. 191 



Vinegar, experiments on the strength of, vi, 258 



Violets, test infusion of, x. 456 



Violine, notice of a new vegeto-alkaline substance, xvii. 385 



Vision restored, when injured or destroyed by the cornea assum- 

 ing a conical form, ii. 403 



observations on the theory of, iii. 374 



experiments and observations on, v. 249 



on the indistinctness of, in optical instruments, and re- 

 medies for it, xvii. 17, 202 



.— singular imperfection in, xix. 368 



Vitality of plants, singular instance of, x. 468 



— . of the blood, observations on, xiii. 110 



VoGEL (M.), on the mutual decomposition of acids and sulphu- 

 retted hydrogen gas, ii. 152 



process of, for bleaching sponge, xviii. 402 



Volatile oils, experiments on the combination of acetic acid and 

 alcohol with, xiv. 425 



Volatility of substances hitherto considered as fixed, iii. 402 



Volcanic rocks, on the composition of, ii. 434 



masses, systematic arrangement of, iii. 201 



islands in the West Indies, geological description of, v. 



311. General observations concerning them, 321 



. appearances in the moon, notice of, xii. 133 



phenomena, hypothesis on the cause of, xvi. 130. Re- 



marks on volcanoes and on volcanic electricity, 131, 181. 

 Eruption in Iceland, 396 

 Volcanoes, definition of, i. 245. Probable cause of the mud 

 volcanoes near the Cimmerian bosphorus, assigned by Pro- 

 fessor Pallas, 246. Conjectures on the cause of, ib. 24>7, 



