166 Tue Microscope. 
REVIEWS. 
THE ROTIFERA OR WHEEL ANIMALCULES. 
This is Part II. of the work. It is to be completed in six 
parts. This work was noticed in our March number. It is in- 
tended to embrace the whole class of the Rotifera; and the 
original drawings will be taken from life. It stands alone as a 
contribution to a department to which scarcely nothing has 
been contributed for nearly half a century. 
Further particulars can be obtained by addressing our Lon- 
don agent, whose address is found on the cover of this journal, 
or by addressing the publishers, Longmans, Green and Co., 39 
Paternoster Row, London, E. C., England. The price is ten 
shillings sixpence. 
AMERICAN MEDICINAL PLANTs. By F. C. Millspaugh. Published 
by Boericke and Tafel, New York and Philadelphia. Fascicle IV. 
In the February number of this jounal we called attention 
to the third part of this exhaustive treatise. It is only neces- 
sary now to call attention to the thorough work both editor and 
publishers are doing. The descriptions are so clear and the 
illustrations of such a high order that the reader will have no 
difficulty in understanding and identifying any of the one hun- 
dred and twenty plants already given. 
THE NATURALIST’S DIRECTORY. Edited by E.S. Cassino. Boston, 1886. 
This edition contains the names arranged both alphabetically and 
geographically. 
Such a work demands a vast amount of labor on the part 
of the editor, and the many naturalists, chemists, physicists and 
astronomers who would find it profitable to possess such a di- 
rectory, should at once send their subscription to the editor, 137 
High St., Boston. 
THE CENTURY. 
This monthly still continues to number its readers by the 
hundreds of thousands. This can only result from one thing: 
the people find in it just what they want to read. The “ war 
series” of papers awakens an intense interest, and the illustra- 
tions are the finest examples of what the art of wood-carving 
can do. 
