[ 6 3 ° ] 
of its ring, notfubjefl to variations of colour and figure, ib. Saturn’s ring not lefs 
folid and fubfiantial than itfelf, p. 4. Its fatellites irregular in their motions, p. 5. 
The light of Saturn’s ring generally blighter than that of the planet, ib. Its ring 
extremely thin, p. 6. Its ling fuppofed to be lefs than 2 fecond in diameter, p. 7. 
Six of Saturn’s fatellites fieen at one view, p. 10. Saturn’s retrograde motion nearly 
4z minutes per day, ib. Its fevenih fatellite difeovered Sept. 17, i;S8, p. ir. 
Its feventh fatellite performs a revolution in 1 day, 8h. 53 m. 9 fee. ib. Its 
fourth fatellite performs a revolution in 15 days, 22 h. 34 m. 38 fee. ib. The 
difiance of the fixth fatellite from the center of the planet about 35.058 fee. ib. 
■-Its feventh fatellite makes one revolution in 22 h. 40 min. 46 fee. p. 12 . The 
difiance of the feventh fatellite from the center of Saturn about 27.366 fee. ib. The 
feventh fatellite much fmailer than the fixth, ib. Obfervations on Saturn, i:s 
belts, and its figure, p. 13. Saturn fuppofed to have an atmofphere of a con- 
fiderable denfity, p. 16. Saturn turns upon an axis which is perpendicular to it* 
ring, ib. This planet, like Jupler, Mars, and the Earth, flattened at the poles, 
p. 17. Saturn’s body of unequal diameters, the equatorial one being the longeft, ib. 
Obfervation of the trar.fit of the fourth fatellite over the diik of Saturn, p. 18. On 
the fatellites of the planet Saturn, and the rotation of its ring on an axis, p. 427. 
Qbfervations on the fifth fatellite of Saturn, p. 432. Obfervations on the fourth 
fatellite of Saturn, p. 438. Obfervations on the third fatellite of Saturn, p. 
444. Obfervations on the fecond fatellite of Saturn, p. 450. Obfervations 011 
the firft fatellite of Saturn, p. 456. Obfervations on the fixth fatellite of Sa- 
turn, p.463. Obfervations on the feventh fatellite of Saturn, p. 475. Tables for 
the fie vc n fate.lites of Saturn, p. 488. fable containing the faturnicentric motion 
of the fiateliites of Saturn in months, p. 489. Table containing the motion of the 
fatellites of Saturn in days, p. 490. Table containing the motion of Saturn’s fatel- 
lites in hours, p. 491. Table of the motions of the fatellites of Saturn in minutes, 
p. 492. Table of the rotation of Saturn’s ring, p. 491. 
Scotland , Wefiern Hies of, account of firata and volcanic appearances in, p. 73. 
Severndroeg Cajlle, on Shooter’s Hill, its latitude, longitude, &c. p.232. 
Siam, people of, borrow their knowledge of aftronomy from the Hindoos, p. 575. Ac- 
count ot th„ chi onolo^ical eras in ufe among the Siamefe, ib. The Siamefe have two 
eras, the one termed their civil, the other their afironomical era, ib. The civil era 
of the Siamefe computed from the fuppofed time of the introduction of their religion 
by Sotnmona-codom , 544 years before Chrifi, ib. Their afironomical era founded 
upon the tables and modes of calculation adopted from the Hindoos, ib. The Si- - 
amefie fiolar year, its length, p. 376. The Siamefe, like the Hindoos, accufiomed to 
make ufe of a cycle of fixty years, ib. 
Silver, eafily and copioufly diflohei by a mixture of oil of vitriol and nitre, p. 362. 
New procefs for feparating filver from copper, p. 367. On the precipitation of filver 
2 from 
