906 
INDEX. 
Sphceria, fructification of various species of, 543. 
Stability of loose earth, 9. 
Standard of length, account of the construction of the new national, and of its principal copies, 621. 
Strength of pillars of cast iron, experimental researches on the, 851 (see Hodgkinsox). 
Symmetrical functions of the roots of an equation, 489 j of certain systems of the roots of two equations, 
717. 
T. 
Terrestrial temperature, 805 (see Hopkins). 
Tetrallylarsonium, 5/1. 
Tyndall (Professor John) and Huxley (Professor T. H.). On the Structure and Motion of Glaciers, 
327. — On the viscous theory of glaciers, 327 ; on the regelatiou of ice, and its relation to glacial 
phenomena, 329 ; on the veined structure of glacier ice, 333 ; on the relation of slaty cleavage to 
the veined structure, 336 ; on the “ dirt-bands ” of glaciers, 342. 
V. 
Vapour-densities, process for determining, 460. 
Veined structure of glaciei' ice, 333. 
Viscous theory of glaciers, 327. 
W. 
M'^illiams (C. G., Esq.). On some of the Products of the Destructive Distillation of Boghead Coal. Part I., 
447. — On the hydrocarbons unacted on by sulphuric and nitric acids, 451 ; butyle, 453 amyle, 
456 ; caproyle, 457 ; process for determining vapour-densities, 460. 
Part 11., 737. — Caproylene, 742; oenanthylene, 743. 
Y. 
Yorke (Colonel P.). Researches on Silica, 533. 
LONDON. 
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