INDEX. 
Priestley , Dr. Remarks on his opinion respecting the colour of 
blood, ------- 
Prostate gland , on calculus from it. 
page 
416 
39 6 
R 
Rabbits , experiments on them, respecting impregnation, 164, 173, 199 
Refractions , horizontal , observations on those which affect the ap- 
pearance of terrestrial objects, &c. 29 
Robins , Mr. Remarks on his computation of the force of gun- 
powder, - 223,232,236,268,277,281,288 
Rome de Lisle. Remarks on a fact mentioned by him, 381 
Rum ford, Benjamin, Count of. Letter from him, announcing 
a donation to the Royal Society, for the purpose of instituting 
a prize medal, - - - - - 215 
• Experiments to determine the 
force of fired gunpowder, - 222 
Account of the loss of his pa- 
pers, &c. ----- 256 
S 
Satellites of Jupiter. See Jupiter. 
Silver , on the action of nitre upon it, 
Sobieski's shield , on a variable star therein. 
Specula for reflectors , remarks on. 
Squinting , remarks on, _ 
Stars , on the periodical changes of brightness of two, 
third catalogue of their comparative brightness, 
. additional notes to the first catalogue, 
additional notes to the second catalogue, 
on those in Andromeda, 
Aquarius, 
Aquila, - 
Aries, - - - 
* Bootes, 
Cancer, 
Capricornus, 
Cassiopea, - 
— — — Centaurus, 
Cepheus, 
Cetus, - - - 
Corona Borealis, 
Cygnus, 
Eridanus, - - - 
221 
- 133 
- 377 
12 
*33 
293 » 307 
2 97 
301 
3°7» 321 
2 97 
299 
301 
3°9> 321 
3 11 * 321 
299 
- 302 
3 i 4 
3*4. 322 
3°3 
3*5> 322 
300 
3°4 
