314 BOTANICAL GAZETTE [ocToBER 
mosses. Inasmuch as the diagnostic characters of the species are drawn 
chiefly from the author’s experience, every student of mosses may find the 
book not only convenient for the ready determination of miscellaneous col- 
lections, but even helpful in discriminating critical species. Half of the first 
part is devoted to directions for collecting, preserving, mounting, methods of 
manipulation, an account of life history and structure, and an illustrated 
glossary of bryological terms. The beginning of the manual proper occupies 
the remainder, with descriptions of Sphagnaceae, Andreaeaceae, Georgia- 
ceae, Polytrichaceae, Buxbaumiaceae, Fissidentaceae, and Dicranaceae. 
The descriptions of families are rather full, the classification following closely 
Jameson’s Handbook of British Mosses, and they are accompanied by numer- 
ous illustrations of the characteristic structures. Many of the plates are 
reproduced from the Bryo/ogia Europaea, some from Sullivant’s /cones Mus- 
corum, while a goodly number of illustrations are original. The book 
deserves hearty welcome from teachers and students.—CHARLES J. CHAM- 
BERLAIN, 
NOTES POR STUDENTS. 
ATTENTION SHOULD BE CALLED to an important article by F. Cavers” 
on asexual reproduction and regeneration in Hepaticae. The paper supple- 
ments the extensive work of Correns on similar phenomena in the mosses.— 
. ik 
Mr. W. C. W[ORSDELL] writes a historical sketch™ of the phenomenon 
of “double fertilization” in angiosperms in whick most of the literature of the 
subject is mentioned except the work of American students, and this is con- 
spicuous by its absence.—C, R. B 
Dr. EMERICH ZEDERBAUER holds ”™ that two of the Myxobacteriaceae 
described by Thaxter, Myxococcus incrustans and Chondromyces glomeratus, 
and probably all members of the group, are compound organisms, like 
lichens, a true fungus on the one hand in symbiosis with a bacterium on the 
other. He has grown each component separately in pure cultures and studied 
their characteristics.—C. R. B. 
M. Pu. EBERHARDT has made an extended study of the influence of dry 
air and humid air upon the form and structure of plants.'3 The work was 
carried on at the botanical laboratory of the Sorbonne and the experimental 
grounds at Fontainebleau. Plants growing in the ground were covered with 
Cavers, F., oe reproduction in Hepaticae. New Phytologist 2:!12- 
133, 155-165. figs. 8. 1903, 
™ W[orspD ees C., The phenomenon of ee fertilization” in angiosperms ; 
an historical sketch. New Phytologist 2:145-155. 
* ZEDERBAUER, EMERICH, Myxobacteriaceae eine pao zwischen Pilze und 
Bacterien. ser Bot. Zeits. 53 : 309. 1903. 
3EBERHARDT, Pu., Influence de I’air sec et de l’air humide sur la forme et sur 
la structure des végétaux. Ann. Sci. Nat. Bot. VIII. 18: 61-153. ff. 7.. 1903. 
: pve mera te gece cies 
