iii. 366

O.

Opium, useful in the bilious fever of 1780, i. 130 ----, the disease induced by it cured by blood-letting, iv. 357 Onion juice, useful in destroying worms, i. 231

P.

Philadelphia, its situation, i. 74 ----, population, i. 76 ----, diseases between 1760 and 1766, and 1805, iv. 365 Purges, useful in the bilious fever of 1780, i. 127 ----, ----, in the yellow fever of 1793, iii. 231 ----, objections to them answered, iii. 243 Pulse, state of, in old people, i. 439 ----, in the yellow fever of 1793, in persons not confined with it,