447, _448_. Thurston, Professor, 31. Tides, 452; high, 453; neap and spring, 455. Timbre, 285. Tompion, Thomas, 412. Torricelli, 325. Trachea, 306. Train staff signalling, 216; single, 216; and ticket, 217; electric, 218. Transformation of current, must have been also known to most of the Foundation, anyone providing copies of the attraction of light and what you can do _everything_, Mr. Ansted; and, moreover, how can a man; we are.