134 BOTANICAL GAZETTE [FEBRUARY 
or the publication of new species, thinking it better that this compilation 
should not be cited in the future literature of taxonomy. For convenience, 
therefore, Renauld and Cardot’s Musct Americe Septentrionalis has been 
used as a basis, without any intention of expressing adherence to its nomen- 
clature. Although the author emphasizes the fact that this work is a com- 
pilation, and does not regard it as of importance enough to be cited, and even 
feels compelled to apologize for it, nevertheless it represents such a critical 
insight of the group that bryologists will welcome it as both useful and 
important.—J. M. C. 
Mr. Rayna DopGE has issued a small manual of the pteridophytes of 
New England,’ which will prove of service to New England students of the 
group. Following each one of the eight families is a brief account of the 
literature, and in the case of Isoetacee a considerable discussion of the tax- 
onomic characters and the best methods of their recognition are given. Anew 
Isoetes is described, /. foveolata A. A. Eaton ; while some bibliographical con- 
fusion has been developed for 7. Eatoni Dodge. Inthe manual before us this 
latter species appears as ‘‘n. sp.,” while it is fully published, with plates, as a 
new species, in the BoTANICAL GAZETTE for January last. As Mr. Dodge’s 
manual bears the date 1896, and the publication of the GAZETTE bears the 
date January 1897, ordinary usage will cite the former as the place of origi- 
nal publication, although the two publications are really synchronous, and 
the intention was to have the GAZETTE Lemans stand as the original one. 
—J.M.C. 
THE THESIs of Edwin B. Copeland for the degree of doctor of philosophy, 
presented to the University of Halle and separately published, has been dis- 
tributed. Dr. Copeland’s subject is the influence of light and temperature on 
turgor. His experiments are thus summarized: 1. The turgor of the roots 
is not influenced by the illumination of the shoot. 2. Plants deprived of CO2z 
show generally the same turgor as those which can assimilate. 3. In organs 
elongating in darkness turgor is lower than i in control cultures, but it remains 
constant after growth ceases. No influence is exerted by the supply of food, 
whether abundant or not. 4. In those organs whose growth is less than © 
soa under etiolation, the turgor is as high as usual or higher. 5. If 
light into darkness the turgor of the already grown 
parts is not altered i in any “characteristic Saree = relation to the environ- 
_ ment; butif the t th a slow reaction of turgor 
of the stems is observable. From ‘these experiments he concludes that the 
; ze amount of Inencane: roots, stems, and leaves is Pcs ame vege on 
_ 16mo., mae ; 
