12 INDEX. 



Palladium, experiments made on, VI, 407. — characters of, 410. 



Pap ill's digester, experiment made with, V, 8. 



Patterson, Robert, his method of projecting and measuring plane angles 

 VI, 29. — his observations on a lunar eclipse, 59. 



Peach trees, method of preventing the premature decay of, V, 325. me- 

 thod of cultivating them, 327. 



Peak, C. TV. his description of some improvements in the common fire- 

 place, V, 320. 



Phenomenon, description of one seen at Baton Rouge, VI, 25.— another, 41. 



Philadelphia, longitude of, VI, 297. — latitude, 297. — statement of deaths, 

 with the diseases and ages in, from 1 807 to 1 809, 403. 



Phlogisticated air. See Air. 



Phlogiston, doctrine of, V, 28. 



Phosphoric air, not always inflammable by the admission of atmospheric 

 air, V, 9. 



Phosphorus, experiments made with, in the nitrous acid, V, 5. 



Planetarium, pendant, description of, V, 87. 



Platina, account of the volatilisation of, VI, 99. 



Platina in aqua regia, experiments on, V, 11. 



Plumbago, experiments on, V, 28. 



Poisonous honey, account of, V, 51. 



Polypes. See Dupont. 



Porto-Pico,longhude of, VI, 213, 220. 



Potash, constituent parts of, VI, 244. 



Precipitate per se, experiments on, V, 29. 



Premium, conditions of the Magellanic, V, v. — VI, vii. 



Pressure, effects of, in the absorption of air by water, V, 24. 



Priestley, Dr. Joseph, his experiments on the transmission of acids and 

 other liquors in the form of vapours, over several substances in a hot 

 earthen tube, V, 1. — experiments relating to the change of place in 

 different kinds of air, &c. 14. — experiments relating to the absorption 

 of air by water, 21. — miscellaneous experiments relating to the doc- 

 trine of phlogiston, 28. — experiments on the production of air by the 

 freezing of water, 36. — experiments on air exposed to heat in metallic 

 tubes, 42. — observations and experiments relating to equivocal or spon- 

 taneous generation, VI, 119. — observations on the discovery of nitre 

 in common salt which had been frequently mixed with snow, 129v — 

 proceedings of the Society on his death, 190. 

 Primitive soil of the state of Maryland, VI, 321. — extent of, in the United 



States, 413. 

 Pyrites, experiments on those found in meteoric stones, VI, 340. 

 Phosphorus, how made, V, 12. — experiments on, 29. 



Q 



$>iiarries. See Freestone. 



Quartz, contained in the gneiss of Maryland, VI, 322. 



£>iiartzose sand, constitutes the alluvial soil of Maryland, VI, 31©. 



