INDEX. 
Pores of the sun , observations on. 
Potash , remarks on, ----- 
Powder, Dr. James’s, observations on. 
Presents received by the Royal Society, from July 1800 to June 
1801, - - - - - - 
Proteus Anguinus, description of an animal so called, 
Pulvis Antimonialis , observations on. 
page 
268, 292 
1 97 
375 
45i 
241 
376 
R 
Reflecting circle , on an improved one, 
Refraction , propositions concerning, 
— on that of the crystalline lens. 
Rhinoceros , anatomical description of a male one, 
Ridges of the sun , observations on. 
363 
2 7 
145 
267, 283 
Sap, on its ascent in trees, - 
Schreibers, Charles, M. D. A historical and anatomical descrip- 
tion of a doubtful amphibious animal of Germany, called, by 
333 
Laurenti, Proteus Anguinus, 
Seals , remarks on their teeth, 
Shallows of the Sun, observations on. 
Silver, discovery of it in Herland copper mine, 
Siren Lacertina , remarks on. 
Soda, remarks on, - 
Spear-head , account of one found in an elephant’s tusk. 
Sphere , theorem assigning certain portions of one, 
Sun, observations to investigate its nature, 
on its openings, - - - 
on its shallows, - 
on its ridges, - - - - 
on its nodules, - 
on its corrugations, - 
* on its indentations, - 
• on its pores, - - - 
.. of the regions of solar clouds, 
of the solar atmosphere, 
explanation of the solar phenomena, 
= — — cause of its mottled appearance, 
. signs of scarcity of luminous matter in it, 
signs of abundance of luminous matter in it, 
— — on the appearance and disappearance of solar spots, 
— — on viewing it through liquids, - 
267, 
241 
327 
267, 280 
*59 
258 
*97 
1 65 
*53 
265, 354 
270, 305 
267, 280, 305 
2 67, 283, 305 
267, 286, 305 
268, 287, 304 
268, 289, 304 
268, 292, 303 
293 
300 
303 
305 
306 
308 
312 
35 s 
