474 Scientific Intelligence. ' 



have not been introduced with too great detail for the beginner. 

 Third, the reader is not allowed to forget that physiology is an 

 experimental science and should properly be taught as such ; 

 accordingly, the general method of the book tends to encourage 

 observation and experiment. A series of carefully defined exer- 

 cises forms a useful appendix. l. b. m. 



3. Experimental Morphology, Part II ; by C. B. Davenport. 

 New York, 1899. — In this second installment of his valuable 

 treatise Dr. Davenport considers the effects of chemical and 

 physical agents on growth. Plants lend themselves so readily to 

 observations respecting growth, that they have received from Dr. 

 Davenport a degree of attention in this work which compels the 

 student of plant physiology to accept his aid. The literature of 

 the whole province has been carefully examined, and few omis- 

 sions can be noted in the references. On the whole, the editorial 

 work has been wonderfully well done, and the errors are so few 

 that they need not be mentioned here ; they do not appear likely 

 to mislead seriously any students who make use of the vast 

 amount of material which has been gathered patiently, and for 

 the most part has been well arranged. The botanical phases of 

 experimental morphology are at present attracting a large num- 

 ber of enthusiastic students who are moved to consider questions 

 in a broad way, and are stimulated by just such books as Dr. 

 Davenport's, to ask some of these questions, at first hand, of 

 nature. g. l. g. 



4. Recherche, Captage et Am'enagement des Sources Thermo- 

 Minerales. Origine des eaux Thermo-Minerales; Geologie ; Pro- 

 prietes physiques et chimiques. By L. De Lajjnay, pp. x, 635, 

 large 8vo. Paris, 1899 (Librairie Polytechnique Baudry et Cie., 

 editeurs). — M. De Launay has added another to the series of 

 highly valuable practical works prepared by him. The previous 

 volumes on Mineral Deposits, on the Gold Mines of Transvaal, and 

 the Diamonds of South Africa, have been noticed in earlier num- 

 bers of this Journal. The present volume discusses thermal 

 springs in different parts of the world. The treatment is thor- 

 ough and exhaustive. The origin of the springs and their rela- 

 tion to geological and topographical features is first taken up. 

 Then comes a discussion of their chemical composition with the 

 salts and gas in solution, accompanied by numerous analytical 

 tables. Following these are data in regard to the temperature at 

 different springs, ranging, for example, from 81°*5 at Chaudes- 

 Aigu.es (Cantal) to 27° at Uriage (Isere). The latter half of the 

 work goes more minutely into the account of the individual locali- 

 ties in different parts of the world, giving a large amount of very 

 interesting information about a multitude of places. The work 

 closes with details in regard to the distribution of the hot water 

 to the different establishments, with numerous excellent illustra- 

 tions. 



OBITUARY. 



Dr. Franz Ritter von Hauer, the distinguished Austrian 

 geologist, died March 20th, at the age of seventy-seven years. 



