168 INDEX, 



Purity of flour, directions for ascertaining, vii. 370 



Purple colour (new) for oil painting, vii. 3S0. Of Cassius, new 

 mode of preparing, 385 



Purpuric acid, directions for preparing, viii. 373 



■ note on, xvi. 104 



Puzzolana (artificial), mode of preparing, xviii. 381 



Pyramids, researches among, vi. 176 



Pyrenees, botanical researches in the, ii. 50 



Pyrites, chemical composition of the white efflorescing, xiv. 208 



Pyro-citric acid, properties of, xiv. 423. Its constituent parts, 436 



Pyro-electricity of the tourmaline, vii, 397 



of minerals, xiii. 430 



Pyroligneous acid, antiseptic properties of, vii. 397. x. 173. Pu- 

 rification of, ib. 



" proved not to be discovered by the French, 



viii. 3G8 



ether, properties of, xiv. 436 



preparation and analysis of, xvii. 171 



Pyrometer, description and uses of a new one, xi. 309. New 



material recommended for, xiii. 427 

 Pyromucous acid, preparation and analysis of, vii. 179 

 Pyrophorus obtained from the tartrate of lead, xvi. 385 



Quack medicines, analyses of, xiv. 374 



Quartz, phaenomena attending the process of the solution of,i. 29 



• • analysis of crystallized stalactitic, xv. 169 



• • peculiar fracture of xviii. 167 



Quassia simarouha^ analysis of the bark of, xiii. 416 



QuiNCY (M. Quartremere de), letters of, on the Elgin marbles, 



and the sculptures of the Temple of Minerva at Athens, vii. 21 

 Quinia, process for obtaining, [xii. 325. Its use in intermittent 



fevers, 327 



— analysis of, xvi. 283 



sulphate of, how prepared, xix. 162 



