literature of Vanadium. 133 



cortex, or of the appearance of the leaf-scaTs, neither of which 

 is perceptible. It is probably 8. lepidodendrifolia, with scat- 

 tered fruits. 



In conclusion, it appears to me extremely probable that the 

 following forms, which are usually found associated, are spe- 

 cifically identical : 



S. lepidodendrifolia i Brongniart. 



S* rhomboided and obliqua, BrongL 



8. sculpta, Lesq. 



/Si Brardii, Brongt. 



8. Menardi, Brongt, 



8. Serlii, Brongt. 



8. Defrancii, Brongt. 

 With these, future investigation will perhaps unite, 



8. stellata, Lesq. 



8. spinulosa, Germ, 



XIII. Index to the Literature of Vanadium, 1801-1877. 



By GEORGE J. ROCKWELL, M. A , 



Late Professor of Chemistry in the Imperial University of Tokio, Japan. 



Read April 2, 1877. 



I offer this "Index to the Literature of Yanadium " to 

 chemists, with the hope that it may be of use to them in their 

 researches respecting- an element which is beginning to be of 

 value in the arts, and has been the subject of much study 

 during the past year. Dr. H. C. Bolton first suggested the 

 idea of compiling indices to the literature of each of the ele- 

 ments, and has published two, on Uranium and on Manga- 

 nese, in the Annals of this Society ; while a third, on Tita- 

 nium, has been prepared by Mr. E. J. Hallock. 



G.J.B. 



