Part 67

Torsion-balance, Coulomb's, 109, 168.

Torricelli, on virtual velocities, 150; his law of liquid efflux, 150; on the atmosphere, 273.

Tourist, journey of, work of the inquirer compared to, 17, 29, 30.

Transatlantic cable, 108.

Transformation and adaptation in scientific thought, 214-235.

Transformation of ideas, 63.

Transformative law of the energies, 172.

Translation, difficulties of, 354.

Tree, conceptual life compared to a, 231.

Triangle, mutual dependence of the sides and angles of a, 179.

Triple accord, 46.

Truth, wooed by the inquirer, 45; difficulty of its acquisition, 46.

Tumblers, resounding, 23.

Tuning-forks, explanation of their motion, 22 et seq.

Tylor, 186.

Tympanum, 18.

Type, natural laws likened to, 193; words compared to, 191.

Ulysses, 347.

Understanding, what it means, 211.

Uniforms, do not fit heads, 369.

Unique determination, 181-182.

Unison, 43.

Unit, electrostatic, 111. See Force and Work.

United States, 336.

Universal Real Character, a, 192.

Utility of physical science, 351.

Variation, the method of, in science, 230; in biology, 216.

Velocity, of light, 48 et seq.; of the descent of bodies, 143 et seq.; meaning of, 204; virtual, 149-155.