662 
INDEX. 
T. 
Thallium, atomic weight of, 277. 
Thaumops pellucida, 629, 637. 
y. 
Volcanoes, theory of, 147. 
W. 
Wavellite, 585. 
Willemoes-Suhm (R. von) . On a new Genus of Amphipod Crustaceans, 629. — Appendix. On the 
Male and Structure of Thaumops pellucida, 637. 
Williamson (W. C.). On the Organization of the Fossil Plants of the Coal-measures. — Part IV. 
Dictyoxylon, Lyginodendron, and Heterangium, 377. 
Wind, diurnal variations of, in connexion with those of the barometer, 1 . 
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