242 Scientific Intelligence. 



texts and happily less of the more recent tendency toward a 

 presentation so severe as to engender in most beginners a hatred, 

 rather than a love of the subject. The author has adopted, in 

 general, if not uniformly, a happy method of leading up to prin- 

 ciples through a simple discussion of the knowledge already 

 in the student's possession. The mathematical expressions are 

 developed in a natural and consistent manner and are made to 

 serve effectively both in summarizing the respective topics and 

 in revealing to the student " the essential unity of the subject." 

 Practically all of the illustrations are diagrammatic and clear. 

 Problems are found in ample number and variety. The text 

 lends itself readily to abridgement or amplification, and taken 

 as a whole this appears to be one of the best recent text-books. 



D. A. K. 



4. Die InseJctenfamilie der Phasmiden * bearbeitet von K. 

 Brunner v. Wattenwtl und Jos. Redtbnbacher. II Liefe- 

 rung, pp. 181-340 ; III Schluss Lieferung, pp 341-589, with 

 plates xvi-xxvii. Leipzig, 1908 (Wm. Engelmann). — The first 

 part of this monumental work on the Phasmids appeared in the 

 spring of 1907 (see vol. xxiii, 398). The two parts now issued 

 complete the work. Of these the second is devoted to the 

 Clitumnini, Lonchodini and Bacunculini; it has been prepared 

 by the senior editor. The third and concluding part embraces 

 the Phibalosomini, Acrophyllini, and Necrosciini and has been 

 worked up by Prof. Redtenbacher. The whole work is admir- 

 ably thorough and is based, not only upon the very extensive 

 private collections of the authors, but they have also taken 

 advantage of the material in various public museums, especially 

 those in Europe, which have most freely placed their collections 

 at their disposal. The publication of the whole work in the 

 liberal form presented, with its numerous plates, has been made 

 possible through the support of the Imperial Academy at Vienna, 

 the funds being furnished by the Treitl Foundation. 



5. Les Depots Marins ; Leon W. Collet. Pp.' 325, with 

 35 figures. Paris, 1908 (O. Doin). — This volume forms one of 

 the issues of the " Encyclopedic scientifique" which is being pub- 

 lished under the direction of Dr. Toulouse. If carried through 

 on the very liberal scale planned, the Encyclopedia will include 

 40 sections, aggregating about 1000 volumes. 



The work in hand is one of seven volumes, to be devoted to 

 physical oceanography, which are in charge of Dr. J. Richard. 

 The author, who has studied with Sir John Murray at Edinburgh, 

 presents here an excellent summary of the whole subject of 

 marine depositions, giving the results contained in the well-known 

 work by Murray and Renard on Deep Sea Deposits, and also 

 bringing the various branches of the subject down to date. The 

 concise, systematic treatment of the whole makes it a very con- 

 venient resume of a subject of more than usual interest. 



Obituary. 



James Duncan Hague, long prominent as a mining engineer, 

 died on August 5 at the age of seventy-two years. He was one 

 of the geologists of the Survey of the 40th Parallel in 1867-70. 



