108 Scientific Intelligence. 



<lc Saula Rosa, and also of the lead tungstate, raspite, which lias 

 only been known hitherto from the original locality in New South 

 Wales ami from Brazil. — Soc. Geol. Mexicana, and Mem.. Alzate, 

 xxviii. 



8. Minerals from the Belgian Congo. — Dr. 11. Buttgenbach 

 gives an account of the Congo minerals in the Annates du Mus'ee 

 tin Congo Beige. Among the points of special interest may be 

 noticed the diamonds in Katanga, the various copper minerals 

 including clialcocite, dioptase and azurite, also of strontianite 

 from Kindu. 



9. JJie Anwendunq der stereographiscJien Projektion bei 

 kristallographischen Untersuchungen/bjSi.'E. Boeke. Pp. viii, 

 58; 1 plate and 57 text-figures. Berlin, 1911 (Gebriider Born- 

 traeger). — This little book has been written with the object of 

 furnishing German students of crystallography a description 

 of the principles of the stereographic projection together with 

 illustrations of the various uses to which it can be put. The 

 protractor which it describes is the stereographic net devised by 

 Wulff. This consists in a net which shows the projection of all 

 great and small circles drawn for every two degrees. The draw- 

 ing of the stereographic projection is made on transparent paper 

 and then by placing it above the stereographic net in the proper 

 position any desired angle can be measured, etc. It is to be 

 regretted that the book did not also describe the transparent 

 protractors and the stereographic scales devised by Penfield. 

 The book is well written and illustrated and should serve to 

 extend the use of this valuable method of projection. w. e. f. 



IT. Miscellaneous Scientific Intelligence. 



1. A Second Course in Algebra ; by Prof. IT. E. IIawkes, 

 Columbia University, and W. A. Luby and F. C. Touton, Cen- 

 tral High School, Kansas City. Pp. vii, 264. Boston and New 

 York, 1911 (Ginn & Co.). — The present work, together with the 

 First Course in Algebra by the same authors and the Advanced 

 Algebra by Professor Havvkes, completes a series adapted to the 

 use of a very large body of students and already extensively 

 used. The volume now under review is admirable for clearness 

 of presentation and freshness of statement. Graphical methods 

 are used more freely and effectively than in any work on algebra 

 known to the writer of this notice. Historical notes are also in- 

 serted with great frequency and add much to the interest and value 

 of the book. It may, we think, be fairly said that no treatise on 

 algebra now before the public is likely to produce as vivid an 

 interest in that science in so many students. w. b. 



2. Les Progveset IJ Evolution de V Astronomic ; par J. Mas- 

 cart (Estract from Astronomia Popolare, Turin). Pp. 18. 

 — An estimate, thoughtful and suggestive, of the best lines of 

 development in observational astronomy, and of the possibility of 

 increased efficiency through the coordination of work and the 

 cooperation of the workers. w. b. 



