INDEX. 



497 



Thomson's (Sir W.), electrical images, theory of, 68—70 

 Papers by, on electricity and magnetism, referred 



to, 58, 60, 67, 68, 70, 73, 76 

 Thranitaj, 89 



Translations of a point, laws of, 296 ; velocities of, 298 

 Triangles, similar, new treatment of doctrine of, 169 

 Trireme (Athenian), Dr Donaldson on, 84; rowers of, 



85, 87; their arrangement, 85, 86; explanation of 



difficulties in Tragedians, 92, 93. 

 Tuning and temperament, observations on, 141 — 145 



Universe of a proposition, limitation of, contended for, 



190 

 'Yn-ofoi/iOTa, explanation of word, 307 

 Urinary secretion, manifestation of current force during, 



255, 256 



Velocities of a point with respect to revolving axes, 5, 6 

 Velocities and accelerations with respect to moving 

 axes, 1 — 20 



Weber's physical theory of electrodynamics, assump- 

 tions of, stated and discussed, 66, 67 



Whewell, W., D.D. On the Platonic Theory of Ideas, 

 94 ; two primary parts of theory, 97 ; the Parmenides, 



an Eleatic dialogue, 100; on Sophista and Politicus 

 of Plato, 146, 160 ; on method of division in Plise- 

 drus, 163 



Whole, arithmetical, in logic, 190, 194, 209,212 ; proba- 

 ble, not composed entirely of probable parts, 41 1 



Wholes, three logical, 209 



WoUaston, views of, on animal secretions, 248, 253; 

 his paper {Phil. Mag. Vol. xxxiii. p. 488) quoted, 

 253 ; his conclusion that secretion is the effect of a 

 power similar to that which exists in a voltaic circle, 



Woolhouse, his Essay on Musical Intervals, referred 

 to, 135 



Xenophanes, founder of Eleatic school, 154 



Young, Dr Thomas, unfavourable opinion of, on Smith's 

 work on Harmonics, 133, 134 ; his opinion shewn to 

 be unfounded, owing to his having confused Tartini's 

 beats with Smith's, 133, 134 



Zeno in the Parmenides, 97, sqq. 

 Zoroaster, same as Er the Pamphylian, 313 

 ZygitSB, 87. 



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