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methods into the domain of the compound microscope. The 

 earlier work dealt specifically with a hundred of our larger and 

 more easily recognized mosses ; the present, while not aiming at 

 completeness, is to treat of more than two hundred of the more 

 common species of the northeastern United States. The " Intro- 

 duction " is followed by chapters on " Classification and Nomen- 

 clature," "The Collection and Preservation of Mosses," "How 

 to Mount Mosses," " Methods of Manipulation," " Life-History 

 and Structure of the Moss-Plant," "Illustrated Glossary of Bry- 

 ological Terms," and " List of the more important Works on 

 Mosses that will be of Help to American Students ;" then comes 

 the " Manual," which includes keys to the principal families and 

 genera and to the species of the larger genera. The descriptions 

 are brief and are concerned only with the more important and 

 distinctive characters. Most of them are accompanied by illus- 

 trations of the species described. Many of the figures and plates 

 are photographic reproductions of the beautiful plates of the 

 Bryologia Europaea and of Sullivant's Icones Muscorum, which 

 the author modestly and frankly says are "superior to any that 

 I could have had made." Each of the borrowed plates is duly 

 credited to its source, though, unfortunately, in a few cases, 

 " (Bry. Eur.)" immediately follows the name of the plant on the 

 plate, as is done by some authors when they wish to indicate that 

 merely the name originated in the Bryologia Europaea. The 

 author justifies his free use of these classical figures by the plea 

 that they are in this way being made accessible to very many 

 who would otherwise be unable to consult them. It is perhaps 

 to be fairly questioned whether a student who has got beyond 

 " Mosses with a Hand-Lens," the author's earlier and simpler 

 work, is not prepared for a manual which shall attempt to include 

 descriptions of all of the mosses of the region covered, yet the 

 present work will doubtless meet a ready sale and will do much 

 toward popularizing the study of these interesting plants. The 

 style is attractive both as to literary and mechanical execution. 

 It is expected that four or five parts will complete the work and 

 that Part 2 will be ready for distribution in January, 1904. 



M. A. H. 



