8 CONTRIBUTIONS TO MINERALOGY. [bull. 262. 
although not absolutely new, is now thoroughly established as a 
definite mineral. The true character of carnotite is shown in Doctor 
Hillebrand's research, and the same chemist has worked out more 
fully than his predecessors the composition of yttrialite and its rela- 
tions to other species. Mr. Schaller's very complete study of 
dumortierite is also worthy of especial mention, and his notes upon 
other minerals from California are but the first fruits of a much 
larger research which is already well under way. 
