Recent Literature. — pax 923 
RECENT LITERATURE. 
Wolles Fresh-Water Algze of the United States.t—In the 
two substantial volumes of this long-looked-for work we have 
brought together a great mass of useful knowledge, which will 
long be a monument to the industry and patience of the author. 
The labor involved in the preparation of the plates alone, with 
their multitudes of figures, is something enormous, and, when 
We remember that this work was all performed by the author 
f one cannot help admiring the spirit which prompted the 
àre observed in the present book may be much more easily 
oided or corrected in future publications. The book thus marks 
important advance in this field of botanical science. 
Ae author, in an introductory chapter of about half a dozen 
r. Anton Hansgirg, of the Royal University of Prague. 
summing up, our author says, “It is evident that, sooner or 
Present system is altogether too artificial, separating, as it does, 
5 not only into different genera, but into different 
‘s and orders, which are genetically connected. Our pres- 
ge is too imperfect for a complete arrangement. It 
aok upon the system he adopts, that “ many genera 
“Og hla which have literally no worth, but they serve 
e. 
Ree treated in the book are arranged under three classes, 
“iodophyceze, Chlorophycez, and Cyanophycee. The 
trangement : 
Craik Families.—1. Lemaneacese; 2. Porphyracez; 3. Ba- 
TADE cee; 4. Hildebrandtiaceæ. ae 
me Algæ of the United States” (exclusive of the Diatomacez) ; 
2 Desmids of the United States; with two thousand three hundred 
oe agp of Desmids. By the Rev. Francis Wolle, member of 
of Microscopists. Bethlehem, Pa.: The Comenius Press, 1887. 
364; vol. ii., plates Nos, LIV. to CCX. Price, $10.00. 
y 
» 
, the whole system of classification must be changed. The — 
y 
One hundred and fifty-one plates, a few colored, pyre oA ee 
| y : 
ubdivisions are as shown in the following condensed. - 
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3 
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