No. 405.] REVIEWS OF RECENT LITERATURE. 767 
which three are new. One of these, Ceratium curvirostre, resembles 
C. kumaonense, described by Carter in 1871, from Hindostan. The 
cosmopolitan C. hirundinella reaches its greatest development in 
Norwegian waters at the maximum summer temperature, in one 
instance attaining 50,000,000 per square meter of lake surface. 
The inaugural address of Rektor Karl Brandt of the University 
of Kiel reviews the methods, progress, and problems of planktology, 
with special reference to the productivity of the sea. The poverty 
of the tropical oceans is correlated with the greater activity of 
denitrifying organisms in these waters, while the low temperature 
of the arctic seas hinders this process and greater fertility ensues. 
The larval form of Æpischura lacustris, a peculiar asymmetrical 
copepod of our Great Lakes, has been found by Professor C. D. 
Marsh in Green Lake in the winter months. The structure of the 
male abdomen and fifth feet are described in the Transactions of the 
Wisconsin Academy. The development of the larva indicates but 
a remote relation to Diaptomus. The asymmetry appears late in the 
development of the larva. 
No. 3 of Vol. IV of the American Journal of Physiology contains 
the following articles : * The Occurrence and Origin of the Xanthine 
Bases in the Fzces," by W. H. Parker; “ Physiological Studies on 
Mucine,” by Levin; “On the Reactions of Certain Infusoria to the 
Electric Current," by R. Pearl; and “A Plethysmographic Study of 
the Vascular Conditions during Hypnotic Sleep," by E. C. Walden. 
BOTANY. 
The Cyclopedia of American Horticulture.!— The second vol- 
ume of this important work, the first volume of which was noticed in 
the. April number of the American Naturalist, proves equally good 
With its predecessor. Several of the larger genera of Cacti, elabo- 
rated (as to their garden representatives) by well-known students 
of the group, are of especial interest to American botanists ; the 
chapter on the Grape is gratifying to those who hope for the improve- 
ment of other American fruits in as successful a manner as has been 
achieved in grapes; much of historic interest is to be found under 
Greenhouses and Horticulture; and the article on Insects forms an 
re little introduction to entomology. 
y; L. H., and Miller, W. Cyclopedia of American Horticulture (in four 
am v ii, E-M. New York, The Macmillan Company, 1900. 
