Geology and Mineralogy. 89 



siderable alterations and additions to the text of the original 

 volume have been made by the author, which embody the results 

 of more recent researches on methods of analytical work. They 

 relate chieHy to the preparation of samples for analysis and to 

 the estimation of water and the oxides of iron. 



The writer in his preface to the German edition pays a grace- 

 ful tribute to the German masters, especially Bunsen, under whom 

 he studied, and this volume will be evidence to the chemists of 

 that nationality that the seed sowed at that time has brought a 

 fruitful harvest. There is no one who has greater skill, or has 

 had a wider experience, in silicate analysis than the author, or 

 who has done more to bring the analyses of rocks to a high 

 standard, and it is well that his views and methods should have 

 as wide an extension as possible. l. v. p. 



8. Mamial of the Chemical Analysis of Rocks ; by H. S. 

 Washington. Second edition, Revised and Enlarged. 8vo, pp. 

 200. New York, 1910 (Wiley & Sons). — This is a new edition of 

 Washington's useful and practical treatise on rock analysis. New 

 methods and modes of procedure, which have been tested by the 

 author, have been introduced and numerous changes have been 

 made in the text wiiere more detail appeared to be needed. The 

 analysis of carbonate rocks, as a special subject, has not been 

 treated, as the latest work of Dr. Hillebrand, recently noticed in 

 this Journal, covers this, and they are of minor importance to the 

 petrographer. 



The complete and accurate analysis of silicate rocks is one of 

 the most intricate and difficult tasks the analytical chemist is 

 called upon to perform, but by the aid of this work, in which 

 everj^ detail of operation is completely stated, even one of limited 

 experience in this field may attain excellent results if he care- 

 fully follows its directions. It may be confidently recommended 

 to chemists and petrographers, and should find a place in every 

 chemical library. L. v. p. 



9. Handbuch der Minerologie ; von De. Gael Hintze. Erster 

 Band. Dreizehnte Lieferun'g. Pp. 1921-2080. Leipzig, 1910 

 (Veit & Comp.). — The successive parts of Hintze's monumental 

 work on Mineralogy do not appear at vei-y frequent intervals, but 

 are none the less welcome on that account. This is the twenty- 

 fifth section of the entire work and the thirteenth of the first vol- 

 ume ; it is devoted to the oxides and chiefly to the species of the 

 diaspore-goethite group. 



10. Crystallography: An Elenientary Manual for the Labo- 

 ratory; by M. Edwaed Wadswoeth. Pp. xvi (2(»), 299, with 

 612 figures, and 25 plates. Philadelphia (John Joseph McVey), 

 1909. — This new Crystallography is based on the lectures deliv- 

 ered by the author at Harvard in 1873 and subsequently developed 

 by him in University work elsewhere. Being prepared for those 

 studying the subject in a general way only, the mathematical 

 side is omitted entirely, and the discussion is limited to simple 

 and readable descriptions of the different systems and the forms 



