634 
ZOOLOGICAL LITERATURE. 
Leydig, P. Tafeln zur vergleichenden Anatomic. Erstes 
Heft. Zum Nervensystem und den Sinnesorganen der 
Wiirmer und Gliederfussler. Tubingen^ 1864^ folio (ten 
plates, with explanatory text). 
Here at the conclusion of our survey of the literature of the 
neurosomatous animals, we may call attention to the appearance 
of a new work, by Leydig, on Comparative Anatomy with special 
reference to histological details. His ^ Handbuch ^ can hardly 
fail to be acceptable to the student, since a good treatise of this 
kind has lately been much needed. The entire work will con- 
sist of three volumes, each including from about 30-36 sheets 
of letter-press. The moiety of the first volume now before us 
may be resolved into two very distinct divisions. The first of 
these (pp. 1-114), is introductory, and is mainly devoted to a 
survey of the animal tissues. It concludes with some general 
considerations on the organs and organic systems, in relation 
both to the animal body, viewed in the abstract, and to the dif- 
ferent groups into which animals are divided. The second 
division takes up the organic systems, commencing with those 
of animal life, and, before all others, the nervous system. 
Of this section three chapters here appear. The first (pp. 
117-126) treats of animals whose nervous system is absent or 
doubtful (Protozoa — Ccelenterata — Nematoidea) ; the second 
(pp. 126-9), of animals with radiating nervous system (Ccelen- 
terata'^—Echinodermata) ; the third, of animals with laterally 
symmetrical nervous system. This chapter, entirely devoted to 
the nervous system of the Worms and Arthropoda^ brings the 
work, so far as published, to a conclusion (pp. 130-278). 
The utility of the manual for reference is further increased 
by the historical summaries introduced throughout its second 
division, which supply in some degree the plaee of a biblio- 
graphy. 
The Atlas, of which ten plates have been already issued, will 
be found a useful companion to the ^ Handbuch.^ It eontains 
figures from the author's original drawings, to which frequent 
reference is made in his notes. 
Thus the reader will perceive that these works are distinct in 
their scope, both from Leydig's former treatise on Histology and 
the ^ leones Histiologicae ' of Kolliker. 
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