260 



SCIENCE. 



[N. S. Vol. XIV. No. 346. 



comparing the number of pages it contains 

 with the number devoted to the Protozoa in 

 the first edition of the same work. In the first 

 edition 22 pages with 21 figures were given to 

 this group ; here we have 311 pages with 259 

 figures. The account of the Protozoa has thus 

 been expanded until it occupies more space than 

 was devoted in the first edition to the Protozoa, 

 Porifera, Cnidaria, Plathelminthes and Vermes 

 all together. 



This increase in size gives opportunity for a 

 most valuable resume of the recent investiga- 

 tions among unicellular animals. Research 

 has been exceedingly active among the Protozoa 

 in the last decade, and a connected, well-di- 

 gested summing up of the results of this and 

 previous work, such as we have here, is most 

 welcome. In the first edition of the ' Lehrbuch ' 

 all direct reference by name to the various 

 investigators to whom the work was due was 

 excluded from the text. In this edition Pro- 

 fessor Lang wisely gives up this practice, so 

 that the book serves likewise as a valuable 

 introduction to the recent literature and his- 

 tory of the subject. 



In plan of treatment there is much similarity 

 to that of the first edition, though with some 

 modifications. Most important of these is per- 

 haps the preliminary monographic treatment 

 (after the systematic outline) of three typical 

 protozoa — a simple rhizopod, Amceba (pp. 35- 

 47) ; a complicated radiolarian, Coelospathis 

 ancoraia (pp. 47-55), and a ciliate infusorian,*;;! * ' 

 Paramecium caudatum (pp. 55-79). Besides an Morphology of 

 extended account of the structure, much atten- 

 tion is devoted here to the recent physiological 

 work on these organisms, especially to their 

 movements and reactions. The criticism may 

 be made that the relation of the movements 



Eeproduction, etc. The treatment is usually 

 satisfactory, and is comparatively full. Thus, 

 in the first edition the Organs of Nutrition are 

 disposed of in a paragraph, while here twenty- 

 five pages are devoted to the subject. Espe- 

 cially full and valuable is the account of the re- 

 productive processes, which occupies nearly 

 half of the text. Here the recent work of 

 Schaudinn and others on the most varied 

 members of the group is reviewed. The promi- 

 nence of the Sporozoa is throughout noticeable, 

 as compared with any previous general account 

 of the Protozoa. Mention may be made of the 

 especially full accounts of the reproduction and 

 alternation of generations in Tricliosphserium 

 (Schaudinn), Coccidium (Schaudinn), the ma- 

 laria parasite (pp. 229-239), and the Volvocidse. 



The text is clearly written, in an attractive 

 style, and is well illustrated. Exception may 

 perhaps be ta;ken to the large figure of Para- 

 mecium on page 56, which shows an unnatural 

 shape, deformed by pressure, and is so coarsely 

 drawn as to be misleading. 



The book forms an essentially independent 

 work on the Protozoa, and is furnished with 

 extensive literature lists, a table of contents, a 

 table indicating references in the text to organ- 

 isms usually studied in laboratory courses, an 

 alphabetical list of figures and a full index. 

 It will be found valuable to every one interested 

 in this fundamental group of animals. 



kj > H. S. Jennings. 



Spermatophytes. By John M. 

 Coulter, Ph.D., Head of the Department of 

 Botany in the University of Chicago, and 

 Charles J. Chamberlain, Ph.D., Instruc- 

 tor in Botany in the University of Chicago. 

 New York, D. Appleton and Company. 

 1901. Octavo. Pp. X + 188. 



and method of reaction in the infusoria to theU^^/- , 

 form and structure of the organisms is not ^ Methods in Plant Histology. By Charles J. ) 

 brought out, although this appears to be the '^" "' "" ^'' ^ ^"~'' 



central point in the recent work on this subject. 

 In the remainder of the work the plan is 

 followed of treating special topics throughout 

 the entire group of Protozoa. Thus, we have 

 chapters on the Protoplasm, the Pellicle, the 

 Nucleus, the Centrosome, Protective Organs, 

 Organs of Movement, Organs of Nutrition, Res- 

 piratory and Excretory Organs, Sense Organs, 



Chamberlain, Ph.D., Instructor in the Uni- 

 versity of Chicago. Chicago, The University 

 of Chicago Press. 1901. Octavo. Pp. viii 

 + 160. 



It speaks well for the intellectual activity of 

 the corps of botanists in an American uni- 

 versity that these two books, whose prepara- 

 tion must have involved a great deal of labor, 

 have appeared within the past three or four 



