INDEX. W 



Greek fire of the middle ages, conjectures on, xiv. 22 



Green (Mr.), ascent of, in a balloon from Portsea, xiii. 115. 



Observations and experiments made by, during his aerial 



voyage, 116. Remarks thereon, 117 

 Green colour, account of the preparation of a new one, xv. 309 



fire, component parts of, xiv. 231 



Greenland, or polar ice, account of, iv. 247-267. Account of the 



devastations of ice in, 283. 

 Greenwich mural circle, accuracy of, xvi. 1 89. 



computation of the latitude of, xx. 98-108. 



Gregory (Dr.), experiments of, on the velocity of sound, xviii. 



162 

 Gregson (Mr. Joseph), on a new method of constructing chimnies, 



iii. 348. Its advantages, 349. Description of his method, 351 

 Grenadines (islands), geological structure of, v. 314 

 Grief, influence of, in producing changes in the living body, iv. 



209 

 Griffiths (J. R., Esq.), description of an instrument for de- 

 stroying stone in the bladder, xx. 21 

 I (Mr. Ralph), biographical notice of, xiii. 309 

 (Mr. T.) on the component parts oi green fire ^ xiv. 231. 



On the action of water upon metallic arsenic, 233. Method of 



colouring alum crystals, 445 

 experiments on the proportion of charcoal obtained 



from woods having a greater specific gravity than box-wood, 



xvi. 264 



account of an electrical arrangement produced with 



different charcoals and one conducting fluid, xvii. 174 

 experiments on the boiling points of saturated solutions, 



xviii. 89. On the electrical conducting power of melted resi- 

 nous bodies, 403 

 on the hygrometric property of insoluble and difficultly 



soluble compounds, xix. 92-98. On an apparatus for exhibiting 

 the simultaneous rotation, of two voltaic conducting wires 

 round the opposite poles of magnets, 336 

 on the action of water upon glass, with some observa- 



