Part 59

Poetry and science, 30, 31, 351.

Poinsot, on the foundations of mechanics, 152 et seq.

Polarisation, 91; abstractly described by Newton, 242.

Politics, Chinese speak with unwillingness of, 374.

Pollak, 299.

Polyp plant, humanity likened to a, 235.

Pompeii, 234; art in, 80.

Popper J., 172, 216.

Potential, social, 15; electrical, 121 et seq.; measurement of, 126; fall of, 177; swarm of notions in the idea of, 197; its wide scope, 250.

Pottery, invention of, 263.

Prediction, 221 et seq.

Prejudice, the function, power, and dangers of, 232-233.

Preparatory schools, the defects of the German, 346-347; what they should teach, 364 et seq.

Pressure of a stone or of a magnet, will compared to, 14; also 157.

Primitive acts of knowledge the foundation of scientific thought, 190.

Problem, nature of a, 223.

Problems which are wrongly formulated, 308.

Process, Carnot's, 161 et seq.

Projectiles, the effects of the impact of, 310, 327-328; seen with the naked eye, 311, 317; measuring the velocity of, 332; photography of, 309-337.

Prony's brake, 132.

Proof, nature of, 284.

Prophesying events, 220 et seq.

Psalms, quotation from the, 89.

Pseudoscope, Wheatstone's, 96.

Psychology, preceded by astronomy, 90; how reached, 91 et seq.; helps physical science, 104; its method the same as that of physics, 207 et seq.

Pully arrangement, illustrating principle of least superficial area, 12-13.

Purkinje, 284, 285, 291, 299.

Purposes, the acts of nature compared to, 14-15; nature pursues no, 66.