INDEX. 
895 
T. 
Thermographs, discussed, of Lamansky, 663; of Herschel, 664. 
U. 
TJlodendron, 499. 
Y. 
Vogel (H. C.). Examination of his Results as to the Action of Dyes on a Sensitive Collodion Film, 653. 
W. 
Williamson (W. C.). On the Organization of the Fossil Plants of the Coal-Measures.—Part X. 
Including an Examination of the Supposed Radiolarians of the Carboniferous Rocks, 493; supple¬ 
mentary observations, 532. 
