Persia, great comet seen in (1608), 139, 140.
Pertz on the large aerolite that fell in the bed of the River Narni, 116.
Peters, Dr., velocity of stones projected from Aetna, 122.
Peucati, Count Mazari, partial infection of calcareous beds by the contact of syenitic granite in the Tyrol, 262.
Phillips on the temperature of a coalmine at increasing depths, 174.
Philolaus, his astronomical studies, 65; his fragmentary writings, 68-71.
Philosophy of nature, first germ, 37.
Phosphorescence of the sea in the torrid zones, 202.
Physics, their limits, 50; influence of physical science on the wealth and prosperity of nations, 53; province of physical science, 59; distinction betweeen the physical 'history' and physical 'description' of the world, 71, 72; physical science, characteristics of its modern progress, 81.
Pindar, 227.