No. 457.] NOTES AND LITERATURE. 53 
Shells of Land and Water.! — This work is a diversion from the 
usual type of conchological publications, the author endeavors to 
popularize the study of the mollusks by a narrative. A quartette 
consisting of a professor and three students, take various trips to the 
“homes " of the land, fresh-water and marine species; these trips are 
supplemented by frequent visits to the museum, thus in a general way 
all of the more important groups are studied. Their first excursion 
is to the “home” of the fresh-water clam, then a day with the snails 
of the pond, river and brook, followed by a visit to the museum. 
The homes of the land snails are next invaded and the evening is 
spent in the snailery. The next chapter is “ how snails eat” with 
figures of radula, jaws, etc. To study the exotic forms the museum 
is again visited. In the same manner the marine forms are studied, 
with instructions for dredging and preserving specimens. The work 
closes with “some books to study" and a glossary of technical 
terms. 
The book contains 175 pages, the illustrations in the text, of 
which there are upwards of 150, are excellent and well selected, 
while the eight colored plates are beautiful examples of the three 
color process; the work is also embellished by six half-tone plates 
from photographs showing the homes of the various mollusks. To 
those taking up the study of conchology as a pastime the work is 
admirably adapted. 
C WT 
BOTANY. 
Pfeffer’s Plant Physiology. — The completion of the second edi- 
tion of Pfeffer’s Pflanzen physiologic? is a significant event. Ten 
years ago Pfeffer began the revision which has just been completes 
It would have been finished earlier but for the continued ill health of 
the author. Pfeffer’s aim, as pointed out in reviews of the parts 
which have previously appeared, has been to present the science as 
1 Baker, F.C. Shells of Land and Water. A familiar Introduction to the 
Study of Mollusks. Chicago, Mumford, 1903. 8vo, xii + 262 pp. 215 m d 
* Pfeffer, W. Pflanzenphysiologie. Handbuch der Lehre vom Stoffwechsel u 
Kraftwechsel in der Pflanze. 2 te Auflage, 2 vols., Leipzig, Engelmann, un 
3 American Naturalist, vols. XXXII, pp. 450-1, 1898, and XXXVI, pp. 594-5» 
1902. 
