﻿1 903 ] CURRENT LIT ERA TURE 219 



ring mostly in hyperplastic growths and forming a transition to that subject. 

 Hyperplasy exhibits itself in two general types; homoeoplasy, where the ele- 

 ments of the abnormal tissue are the same as those of the tissue from which 

 it is derived, and heteroplasy, where the elements are in part or all different. 

 The latter contains by far the greatest number of cases. Under it are 

 grouped most calluses, wound cork, wound wood, and the vast majority of 

 galls. The latter are very extensively discussed. Most of the galls caused 

 by parasitic plants come under the heading of kataplasms, while the highly 

 organized galls, of definite structure and form, mostly of insect origin, are 

 discussed under the heading of protoplasms. 



The final chapter is devoted to theoretical considerations, and is in 

 many respects the most interesting chapter in the book. Here are consid- 

 ered, so far as our knowledge will allow, the factors causing the various 

 modifications of cells and tissues. The stimuli themselves are discussed, 

 the reaction of cells and tissue to the stimuli, and finally the comparative 

 sensitiveness of different tissues to the stimuli. This chapter, so far as it 

 goes, is a valuable contribution to the study of the developmental mechanics 

 of plants. 



The illustrations are, as a whole, very good, as they illustrate clearly 

 the structural features. They are, with few exceptions, line drawings, and a 

 trifle over half are original. An extensive working bibliography is found 

 in the footnote references. — Ernst A. Bessey. 



MINOR NOTICES. 



Strasburger's^' Das botanische Praciicum has reached the fourth 

 edition. It seems safe to say that no botanical text-book of modern times is 

 more fully abreast of the present state of know^ledge. While the new edi- 

 tion preserves the general arrangement and sequence of subjects which have 

 proved satisfactory in previous editions, each subject has been carefully 

 revised and brought up to date, even matters like the latest investigations 

 upon protoplasmic connections receiving attention. The newest methods in 

 technique are also presented. 



The indices are more extensive than in any previous edition, occupying 

 ^45 pages. There are five, as follows: I. An alphabetical index of the 

 plants which are used as illustrative material. II. A list of plants used as 

 illustrative material, arranged with reference to the time of year at which 

 they should be collected. III. A list of stains and reagents. IV. Reagents, 

 stains, plant substances, imbedding media, and sealing media; chemical 

 exercises; instruments, apparatus, and their use; making of preparations; 

 and physical exercises. V, General index. The first two indices will be 

 suggestive and helpful to those who have the responsibility of keeping labora- 

 tories supplied with illustrative material. The fourth index is so full that in 



^ Strasburger, Eduard, Das botanische Practicum. Fourth edition. Svo. 

 i*P-^ + 77i. figs. 230. Jena: Gustav Fischer. 1902. M 20. 



