I • 
E 6 3 i j 
from nitrous acid by iron, p. 374. Silver readily precipitated from nitrous acid by 
zinc, p. 376. n. Silver may be precipitated in its metallic ftate, from its folution in 
vitriolic acid, by addition of a folution of martial vitriol, p. 384. 
Sores, fugar ants fcarcely to be kept from, p.332. 
Spherical motion, obfervations on, p. 496. Propofitions relating to fpherical motion, 
PP- 497> 5°°> 5 OI > 5°4> 5 I2 > 5 J 9> 53°- 
Spikenard. See Nardus Indie a. 
Spirit of wine gives a phlogifticated quality to nitrous acid, p. 362. 
Spirituous liquors, report on the bed: method of proportioning the excife upon, p Q 321,, 
The weights of an equal bulk of water and pure spirit differ from one another by at 
lealf a fixth part of the weight of the former, ib. Two common methods of takino- 
the fpeciHc gravity of fluids, p. 326. If a ball of glafs be weighed in any fpirituous 
or watery fluid, the adnefion of the fluid will occaflon fome inaccuracy, and render 
the balance comparatively fluggifh, p. 327. 
Strajbourg , its latitude, p. 609. Its diftance from the meridian of Paris, ib. Its lon- 
gitude, ib. • -\ 
Sugar ants. See Ants. 
Sugar canes, method of cultivating them on lands infefled with fugar ants, p. 336. 
Sugar canes, in moil of the Weft India iflands, fuffered to grow up again, without 
replanting, for three, four, ten, fifteen, or twenty years, p. 357, Sugar canes re- 
planted yearly in the ifland of St. Kitt’s, where five hogflieads is the common produce 
per acre in good land, ib. 
Sulphur mixed with powdered charcoal, upon being heated, yields hepatic air in great 
abundance, p. 54. 
Swing field, its latitude, longitude, &c. p. 232. 
Sylhet , great quantities of Tabafheer fuppofed £0 be produced at, p. 279. 
T. 
*TabaJbeer , account of p. 273. A medicinal drug in high repute in many parts of the 
Eaft, ib. Firft introduced to the knowledge of the Wefts rn world through the works 
of the Arabian phyficians, ib Much ufed in the Eaft Indies, but more in 
Turkey, p. 274. Known only by the name of Tabafheer to the Arabs and 
Turks, ib. Known in the Eaft Indies by the name of Vedroo-paloo, Mungel Upoo, 
Yadroo, Garpooram, ib. Dangerous error, common to the old tranflators of the 
Arabian writers, refpedtmg this drug, expofed by Don Garzia dalP Hr to, ib, Much 
of the drug vended in Turkey for Tabafheer fiAitious or adulterated, ib. Arabian x 
medical writers generally agree, that the Tabafheer is a pi odu&ion of the Indian reed, 
p. 275. Undoubtedly a production of the Arundo Bambos of Linnaeus, the Ily of 
the Hortus Malabaricus, and the Arundo Indica arborea maxima, cortice fpinofo, of 
Herman, ib. Fire not a neceffary agent in its produ&ion, ib. Found in what is 
vulgarly called the Female Bamboo, ib. Not found in all bamboos, but only in thofe 
growing;' 
