242 THE AMERICAN NATURALIST. [Vor. XXXIV. 
such a preliminary classification of flower odors in his Z/anzeneben ; 
but, as Mr. Alpers intimates, “a new field of research is spread before 
us for unlimited work" on the composition of volatile substances before 
a classification approaching perfection can be made. 
J. B. S. Norton. 
Erythea, a wide-awake journal devoted largely to Western Ameri- 
can botany, which has existed for seven years, is to be closed with 
the final part for 1899. It will be missed in many libraries, and 
yet the problem of the bibliographer will be simplified by a reduc- 
tion in the number of journals that he must keep track of. 
Part XXI of /ittonia for July to December, 1899, contains the 
following papers by Professor Greene: “ A Decade of New Gutier- 
rezias," “ Some Western Species of Xanthium,” * Four New Violets,” 
* New or Noteworthy Species," XXV-XXVI, “ Segregates of Caltha 
leptosepala,” *New Species of Arenaria," and “West American 
Asperifolie," IV. 
Part III, second series, of Minnesota Botanical Studies contains two 
articles on alga, two on lichens, and synonymic conspectuses of the 
native and garden Aconitums and Aquilegias of North America. 
Cratzgus, a genus in which species-splitting has heretofore been 
restricted to a rather remarkable degree, is proving to comprise a 
very large number of apparently separable forms as represented in 
North America, and Mr. C. D. Beadle, of the Biltmore estate, pub- 
lishes in the Botanical Gazette for January a first instalment of 
studies in this genus, in which seven species are described as new. 
In fact, it appears as if almost anywhere in the middle South and 
West a half dozen nondescript red haws can be picked up in a day’s 
botanizing, in their fruiting season, in autumn. 
Mitella, of the trifida section, is passed in review by Piper in 
Erythea e December, with es result that four new species are 
described. 
The Umbelliferz: of Mexico and Central America are treated in 
an excellent paper by Coulter and Rose, issued in January as a 
brochure comprising pp. 111—159 of the first volume of the Proceed- 
ings of the Washington Academy of Sciences. 
Rhodora for January contains an editorial note and a series of 
short articles on the dwarf mistletoe, Arceuthobium pusillum, in New 
England. 
