1895.] Mineralogy. 469 
The catalogue is very greatly increased in value by its references to the 
literature on the construction and use of each piece of apparatus which 
it describes. 
Klockmann. Text-Book of Mineralogy.’—While the Eng- 
lish language can boast the best completed reference work on mineral- 
ogy—the sixth edition of Dana’s System—it is a lamentable fact that 
it does not possess a single modern class text of the subject. In con- 
trast with this, the Germans have several, the best being those of 
Tschermak and Bauer. To these has been recently added another by 
Klockmann, the Professor of Mineralogy and Geology in the Royal 
Mining School at Clausthal. Klockmann’s text is somewhat shorter 
than any of the others, having but 467 pages (Tschermak, 606; Bauer, 
562), but by means of synoptic descriptions and abbreviations in the 
systematic portions, it is made to include nearly as much material. 
The book is a very valuable acquisition, and, to the writer of these 
notes, seem to possess some advantages over either Tschermak or Bauer 
for the use of its material in the general courses of American universi- 
ties and colleges. Excellent judgment has been shown in the selection 
and arrangement of material, and, perhaps, because of the author’s 
position in a mining academy, the minerals which are of economic im- 
portance are given more prominence, and more stress is laid upon the 
geological occurrence and the mineral association than upon the list of 
localities. The great aid to the memory which the dualistic formule 
furnish seems to be a sufficient reason for making use of them with 
‘elementary classes. In view of the general adoption of the index 
symbols, either alone or with the Naumann’s symbols, it will probably 
be questioned whether it is wise to make exclusive use of the latter 
symbols in a text-book, but it is difficult to give students familiarity 
with both systems at the outset without drawing too much of their at- 
tention from more important matters, and the student finds it easier to 
deal with parameters than with indices. The section on the optical 
properties of minerals is probably the best in the book. In the de- 
scriptive portion, symbols, abbrevations, italics, and small type have 
been used to excellent advantage to aid the eye in referring to the 
descriptions and to indicate degrees of importance of the subject matter. 
In the appendix is included, first, synoptical statements concerning 
minerals of economic importance--ores, gems, etc.; and, second, a key 
® Lehrbuch der Mineralogie fiir Studierende und zum Selbstunterricht, bearbe- 
itet von Dr. F. Klockmann. Pp. xii and 467, with 430 cuts in the text. Enke, 
Stutgart, 1892. Price, M. 
