(403)
O.
OCean, what Seas may be joined with it, 3. 41.
Opticks, Campani's Glasses do excell Divini's; 'tis easie by them to distinguish people at four Leagues distance, 2. 131. and 12. 209. What they discover in Jupiter and Saturn, 1. 1. and 2. The proportions of Apertures in Perspectives reduced to a Table by M. Auzout, 4. 55. Animadverted upon by M. Hook, 4. 69.
How to illuminate Objects to whatsover proportion, proposed by M. Auzout, 4. 75.
Hevelius, Hugenius, and some in England, endeavour to improve Optick Glasses, 6. 98.
Seigneur Burattini's advance in the same inquired after, 19. 348. some answer to it from Paris, 21. 347.
Divini makes good Optick Glasses of Rock-chrystal, that had veins (if he mistook not somewhat else for veins) 20. 362.
To measure the distances of Objects on earth by a Telescope, undertaken by M. Auzout, and others of the Royal Society, 7. 123.
How a Telescope of a few feet in Diameter may draw some hundreds of feet, 7. 127.
How a Glass of a small convex-sphere may be made to reflect the Rayes of Light to a Focus at a far greater distance than is usual, 12. 202.
P.
PArsley, to make it shoot out of the ground in a few hours, see Hon. Fabri 18. 325.
Pictures, a curious way in France of making lively Pictures in Wax, and Maps in a low relieve, 6. 99.
The cause why Pictures seem to look upon all Beholders, on which side soever they place themselves, 18. 326.
Ancient Paintings compar'd with the Modern, and a judgment of the Paintings in several Ages, their perfections, and defects, see M. Felibien, 21. 383.
Petrification, in the wombs of Women, 18. 320. in a Calf in the Cows womb, 1. 10. Stones found in the heart of the Earl of Belcarris, 5. 86. Part of an Elm by incision, or otherwise, petrified a foot above the root and ground, 19. 329. Wood petrified in a sandy ground in England; and of a Stone like a Bone or Osteocolla, 6. 101. A Stone of excellent vertues found in the head of a Serpent in the Indies, 6. 102. The causes of Petrification inquired, 18. 320.
Planets, see Jupiter, Mars, Saturn, Sun, Moon; which are turbinated, and which not, 8. 143. To find the true distances of the Sun and Moon from the earth, 9. 191.
Physicians of China, commended, see Medecins.
Preservation, to preserve small Birds taken out of the shell, or other Fœtus's, for discoveries, 12. 198.
Pulses of the Sick how diligently, and to what good purposes observ'd in China, 14. 249.
R.
RAinbows strangely posited, 13. 219.
Raining of Ashes, and how, 21. 377.
Rice prospers best in watery places, see Marishes, 18. 328.
S.
SAlamander, how it extinguishes fire, and feeds by licking Indian earth, 21. 377.
Salt by excessive use stiffens, and destroys the body, 8. 138.
Salt-Springs, see Springs.
Salt-Peeter how made in the Mogols Dominions, 6. 103.
The proportion of Salt in best Salt-Springs; and what grounds or signs of best Salt, 8. 136.
Sea-fluxes, the cause proposed by way of a new Theory, by Dr. Wallis, 16. 263. See Tydes.
Seas, whether they may be united, 3. 41.
Silk-Worms and Silk-Trade sollicited, 5. 87. and 2. 26. and 12. 201.
Snakes, how they differ from Vipers, 8. 138.
Rattle-Snakes, how sometimes kill'd in Virginia, 3. 43. and 4. 78.
Snow-houses directed, and how to preserve Ice and Snow in Chaffe, 8. 139.
Springs, of peculiar note, n. 7. 127. n. 8. 133. 135. and 136. n. 18. 323.
