1904] CURRENT LITERATURE 475 
ceae. The plates are remarkably good reduced reproductions of those of the 
Bryologia Europaea, as are most of the figures, which sometimes cover a half 
age ormore, ‘The figures original in this work are well drawn and illustrate 
critical features of various species. The comments of the author will also be 
very helpful to those for whom the book is intended. All in all, the work is 
admirable both in conception and in execution. It is difficult to understand 
how it can be sold profitably at the very low price asked.—C. R. B. 
THE FACT that an unhealthy or wounded tree is neither ornamental nor 
serviceable dominates every page of the little volume entitled 7he tree dector9 
The titles of the three sections into which the book is divided are : tree surgery; 
ornamental ; landscaping and floriculture. In the first part, where, how, and 
when to prune a tree are discussed, while the two latter titles deal with the 
problems of landscape gardening. The book is written in a somewhat sensa- 
‘tional and extravagant style, and it contains numerous statements in regard 
to the physiology and pathology of plants that will seem queer to the scientific 
reader. e volume is intended, however, for the layman, and it will doubt- 
less gprs him to a better care of his fruit-bearing and ornamental trees. 
—C, OWE. 
C. F. MILLSPAUGH ” has issued the Generis of his flora of Yucatan. 
In addition to the plates, there are numerous excellent cuts from drawings by 
Miss Agnes Chase, showing a portion of the inflorescence or a single head 
natural size, the achene magnified, and a cross-section of the achene ‘at its 
greatest diameter. The display of the family is somewhat remarkable in that 
’ there are no sige aabglg among the 58 enumerated. € new species in old 
gen n number (Parthenium, Salmea, Encelia), and a new 
genus i ak a Verbesinae is described by J. M. Greenman.— J. M.C. 
THE SIXTH FASCICLE of Dalle Torre and Harms’s Genera Siphonogama- 
rum** has just appeared, including genera from Gentianaceae (6492. Genios- 
temon) to Acanthaceae (7937. Mimulopsis).— J. M. C 
NOTES FOR STUDENTS. 
WANHOFF “ finds that proteids are not destroyed in the course of alcoholic 
fermentation, because the decomposition of the sugar torms substances which 
inhibit the action of the proteolytic enzymes,—C. R. B 
9 DAVEY pion The tree doctor, a book on tree culture illustrated profusely ns 
i ices 8vo. pp. 88. fgs. 767. Akron, Ohio: Published by the author. 19 
$1.0 
10 MILLSPAUGH, C. F., Plantae Se — segs Plants of the 
insular, coastal, and plain. cee of the peninsula of Yuc , Mexic Fasc. 
Compositae (with Agnes Chase). Pp. be 151. pls.g Pind numerous text de Field 
Columb. Mus. Bot. Series 3: no. 2. April 1904. 
1 DALLA TORRE, C. G. DE, and HArRMs, H., Genera Sistecneiusiabies ad systema 
Englerianum conscripta. Fase sc. «é pp. OF ie. Leipzig: Wilhelm Engelmann, 1904. 
M4. 
%IWANHOFF, L., Ueber das Verhalten der Eiweissstoffe bei der alkoholischen 
Girung. Ber. Deutsch, Bot. Gesells. 22: 203-206. 1904. 
