NOTICES OF BOOKS. vn 



Dr. Fischer adds another to the steadily growing lists of proposed 

 classifications, and he attaches considerable importance in delimiting 

 his genera to the absence or the presence of cilia, and to the mode of 

 arrangement of the latter when they exist. 



As an important contribution to the literature of Bacteria, the book 

 will form a necessary addition to the library of all who are interested in 

 these organisms, while even the general reader will find a great deal 

 which cannot but be of great interest to him. 



Das Kleine Botanische Practician fiir Auf anger. Dr. Ed. Stras- 



burger, o. 6. Professor der Botanik an der Universitat Bonn. 



Dritter umgearbeitete Auflage. Mit 121 Holzschnitten. Jena: 

 Verlag von Gustav Fischer, 1897. 



The smaller edition of Prof. Strasburger's Practicuni, like the 

 larger work which is so widely known, has passed through another 

 edition, and we notice several improvements in the volume in its present 

 form. The number of types is reduced, and all will probably agree with 

 the author in recognising that less done thoroughly is better than more 

 done superficially. As would have been expected, the new edition is 

 thoroughly — especially as regards the latest work on nuclei — up to date, 

 and is admirably arranged, not only to suit the learner but also to help 

 the teacher. 



Ban and leben unserer Waldbaunic. Von Dr. M. Biisgen, Professor an 

 der grossherzoglich sachs. Forstlehranstalt in Eisenach. Jena : 

 Verlag von Gustav Fischer, 1897. 



The object of the volume before us is to give a semi-popular 

 account of the structure, physiology and- general mode of life of our 

 forest trees. Such a book is not a very easy one to write, and we can 

 hardly say that Dr. Biisgen has quite succeeded in his task as a whole. 

 Indeed, we must confess to finding his book a trifle dull. It contains, 

 however, some useful summaries of views which have been advanced as 

 explanations of certain problematical phenomena ; thus the mode of 

 the formation of annual rings is- briefly but fairly discussed in five 

 pages, and a tolerably good account is given of the contributions made 

 by Dixon and Soly and by Askenasy towards the solution of the old- 

 standing riddle as to the ascent of sap in tall trees. 



Applied Mechanics, a treatise for the use of students who have time to 

 work experimental, numerical, and graphical exercises illustrating 

 the subject. By John Perry, M.E., D.Sc, F.R.S., Professor of 

 Mechanics and Mathematics at the Royal College of Science, 

 South Kensington. With 371 illustrations. Pp. viii., 678. 

 Cassell & Co., Ltd. 1897. 



In this book Prof. Perry gives the substance of the lectures on 

 Applied Mechanics he has for many years delivered at the Finsbury 



