INDEX. 
839 
Smith (H. J. S.). On Systems of Linear Indeterminate Equations and Congruences, 293. 
Specula, on the construction of large, 681 (see Rosse). 
Steam, surface-condensation of, 133. 
Stewart (B.). On the Great Magnetic Disturbance which extended from August 28 to September 7, 
1859, as recorded by Photography at the Kew Observatory, 423. 
Struve (Otto), observations on nebulae made by, 738. 
Succinic acid, synthesis of, 64. 
Symbols, on the calculus of, 69. 
Symmetric products, method of, 327. 
T. 
Telescopes, reflecting, 681 (see Rosse). 
Transpiration, liquid, in relation to chemical composition, 373. 
Tyxdall (Professor J.). The Bakcrian Lecture. On the Absorption and Radiation of Heat by Gases 
and Vapours, and on the Physical Connexion of Radiation, Absorption, and Conduction, 1. — Mode 
of experiment, 2; results as to absorption by gases and vapours, 7; radiation by gases, 29; phy- 
sical connexion of radiation, absorption, and conduction, 33. 
U. 
Urea and urinary water, the elimination of, 747 (see Smith). 
V. 
Vegetation, sources of the nitrogen of, 431 (see Lawes). 
ViLLE (M.), notice of his experiments on the assimilation of nitrogen by plants, 455 (see Lawes). 
Walker (C. Y.). On Magnetic Storms and Earth-currents, 89. 
Waves analogous to earthquake waves, velocity of propagation of, 655. 
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