ig2 THE PLANT WORLD. 



laboratory work and physiological demonstrations, will also make it 

 an indispensable assistant for all teachers of botany in primary and 

 secondary schools. — O. F. C. 



Illustrated Flora of the Northeastern United States. By Dr. 



N. L. Brittonand Hon. Addison Brown. 3 vols. New York: Chas. 



Scribner's Sons. 



We are in receipt of the third volume of the " Illustrated Flora," 

 marking the completion of this important work, whose value to bota- 

 nists of every grade becomes inore and more evident with its contin- 

 ued use. The most conspicuous feature of this volume is the appen- 

 dix, containing nearly one hundred species in addition to those de- 

 scribed and figured in the text, the important characters being em- 

 phasized by the use of italics. This very helpful modification should 

 have been employed throughout the book. The keys to orders and 

 families, arranged as they are in systematic sequence, will be found 

 useful as concise presentations of leading characters. For ultimate 

 specific determinations the amateur student, at least, will turn to the 

 illustrations, which in the volume before us show a marked improve- 

 ment over those in the early portion of the work. 



Some indication of the need of revision in which stood many of 

 our large and difficult genera, like Aster and Solidago, may be seen 

 in the circumstance that in the former genus alone ( elaborated by 

 Professor Burgess) there are described twelve new species and twenty- 

 nine new varieties. 



Not the least valuable feature of Dr. Britton's Flora is the index 

 of popular plant names, prepared by Judge Brown and appended at 

 the end of the volume; through this it becomes possible to discovert© 

 what species a given epithet has been applied, information often 

 highly necessary in view of the extent to which certain descriptive 

 names, like " snake-root " are used in different significations. The 

 comparatively low price at which the "Illustrated Flora" is sold 

 should result in the rapid exhaustion of the entire edition. — C. L. P. 



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