Mineralogy and Geology. 133 
and first place of publication of a species, and of each name it has 
borne, and of the names of all its varieties, are stated in chrono- 
logical order, with the dates of all publications cited; and besides, 
remarks are added in the text when the subject is one of special 
interest. The author further observes that “the facts and conclu- 
and tru 
at length; a Bibliography giving a long catalogue of books 
consulted, and showing that the ark is an authority on historical 
questions connected with the science; and an annotated index to 
the useful metals and metallic ores. 
title pag 
- a acknowledges his important aid as follows in the preface. 
, Prof. George J. Brush. Prof. Brush 
_ has had sole char i Th ostic 
ge of the blowpipe department. e pyro; 
ave been atively Yebsitten by him; and while he has 
te not generally new, they still are mostly from his 
ay observations. is ski he in analytical chemistry, and his 
rough knowledge of minerals, have enable to remove 
doubts, afford aid and advi arious 
aa advice, and furnish new facts on V 
Points throughout the progress of the work. Prof. Brush has alto 
a “we proofs, while the work was in the press, the benefit o 
TeVision,” 
