and Laboratory Methods. 2708 



V. Wettstein, Dr. Richard R. Handbuch der The second part of Wettstein's text- 

 Systematischen Botanik. II Band; i.Theil, i i i • i /r^ 



with loo text illustrations and one colored ^ook has just appeared. (For review 



plate. 8vo. pp. 1-160. Leipzig und Wien. of Part I see JOURNAL OF APPLIED 



Franz Deuticke, iQo^. 6 marks. ,, , ., ,„,. „, ir^^i rm 



^ -^ Microscopy, 4: 1460-61, 1901. The 



present installment deals with Bryophytes, Pteridophytes, and Gymnosperms ; 

 the remaining section, which is to deal with Angiosperms, will contain the index 

 and will complete the work. The title is, Hatid-Book of Systematic Botany, and 

 the author proposes a complete system of classification, the main features of 

 which were given in the review just referred to. The taxonomic characters of 

 the larger groups, of families, and sometimes of the most important genera, are 

 given and the classification determines the order of treatment. However, the 

 book is of equal interest to the morphologist, for development and embryology are 

 carefully treated and are constantly used to support the author's views of rela- 

 tionships. The illustrations representing the development of organs from the 

 standpoint of comparative morphology are particularly instructive, as is also the 

 plate illustrating the evolution of plants from the Algoe up to the Angiosperm. 

 Considering the able manner in which the morphological part of the work is 

 treated, one is hardly prepared for the statement that in Gymnosperms there is 

 no alternation of generations, although traces of alternation are demonstrable, 

 while in Angiosperms the reduction of the prothallium has proceeded so far 

 that sure homologies can no longer be shown and the alternation of generations 

 has entirely disappeared. Of particular interest are the introductory pages on 

 the evolutionary composition of the Cormophytes, the homologies between the 

 groups of Cormophytes and the causes of the changes in the homologous organs 

 of the Cormophytes. 



The Bryophytes are subdivided, as usual, into Musci and Hepaticae ; in the 

 Pteridophytes three groups are recognized, the Filicinae, Equisetinae, and 

 Lycopodinae ; the Gymnosperms are subdivided into six classes, Cycadinai, 

 Bennettitinai, Cordaitinae, Ginkgoinse, Conifesae, and Gnetinae. 



The remaining part, dealing with Angiosperms, will be awaited with interest. 



c. J. c. 



„ , , . „^ ij i. /^ The cell of the host, /v/Av7A/ (;-(?W(7j-rt! L., 



Stevens, Fraak L., and Stevens, Adeline C. 



Mitosis in the primary nucleus in Syiu-iiy- is about 15// in diameter when the 

 truim deciplens. Bot. Gazette, 35 : 405-4 1's- fungus parasite enters, but a rapid 



pis. 16-17, '903- 01- r 



growth then begins and the host cell 

 soon reaches a diameter of 100/./, the entire space becoming filled by the enlarg- 

 ing parasite, which, however, remains in the unicellular condition. The nucleus 

 of the parasite grows until it reaches a diameter of o5//. After reaching this 

 extreme size — the greatest recorded for the nucleus of a fungus -the nucleus 

 gradually diminishes in size, and at the time of its first division is not more than 

 10// in length. 



Dangeard and Rosen, both of whom studied an allied species, ^. Taraxaci, 

 claim that the first nuclear division is amitotic, and both agree that in the suc- 

 ceeding divisions both amitosis and mitosis occur. The present paper describes 

 the first division in great detail and shows clearly that it is mitotic and that in 

 the late anaphases it agrees well with mitoses in other fungi, particularly with 

 Albugo. The behavior of the chromatin and the formation of the spindle are so 

 peculiar that divergent accounts might be expected. c. j. c. 



