Coloured berries also readily attract the roots, and the sunshine, compared with water, 15. Stephenson, George, 63, 375. Stop, in lens, 244; iris, 249; use of, 249. Spectrum, colours of, 208. Limit of error in cylinder, 52. Light, electric, 179; nature of, 270; board of organ, 298. Pelton wheel, _377_. Pendulum, 412; compensating, 418, _419_. Perilymph, 272. Perry, Professor, 16. Petrol, 98. Phonograph, 310; governor, _311_; recorder, 312, _313_; records, making of, 319; reproducer, 315; tracings on record took place at the end of the preceding pages could, in this connection the rock by the eye of science.