1883. | Recent Literature, 859 
study of the tissues of the fully-grown larva and imago, including 
the teguments of the larva, and its peripheral nervous system and 
sensitive nervous terminations, its involuntary and voluntary 
striated muscles, as well as the motor nervous terminations in the 
voluntary striated muscles. The second part is devoted to a 
The work has been evidently prepared with thoroughness, and 
is the most important contribution of the year to the histology 
and metamorphosis of Arthropoda. 
Cassino’s INTERNATIONAL SCIENTISTS’ Directory.'—This book 
is, in its present form, well arranged, and is both useful as a do- 
mestic and foreign scientific directory. The names are arranged 
in alphabetical order, and the American addresses are not arranged 
as in some of the earlier editions very inconveniently by States. 
e notice some omissions of importance in the German and 
Austrian portions, but when it is taken into account that there 
are in all upwards of 17,000 or 18,000 addresses of naturalists 
living in nearly every country under the sun, any fault-finding for 
sins of omission or commission are scarcely in place. e num- 
ber of addresses of scientists, including amateurs, living in the 
United States and Canada, we should roughly estimate at about 
5500; in Great Britain about 3000; in Germany 1800 (probably 
the number should be doubled or trebled); in Austro-Hungary 
1000; while there are about 2000 French addresses. A direc- 
tory of the scientific societies of the United States and Canada is 
added ; they number about 200. af Oa 
This directory is of great and constant use, as facilitating in- 
tercourse between scientific as well as amateur observers of our 
own and of different countries. i 
Kuncker p'HercuLaIs’ ORGANIZATION AND DEVELOPMENT OF 
Dirrera2—This magnificent work, for such it truly promises to 
be when completed, should be at least introduced to the notice of 
_| The International Scientists Directory. Containing the names, addresses, spe- 
cial departments of study, etc., of amateur and professional naturalists, chemists, 
physicists, astronomers, étc., in America, Europe, Asia, Africa and Oceanica. Com- 
ay by SamueL E. Cassino. Boston, S. E. Cassino & Co. 1883. 1I2mo, pp. 
* Recherches sur l’Organization et le Développement des Diptéres et en particu- 
lier des Volucelles de la famille des Syrphides. Par JULES KUNCKEL D’HERCU- 
Lais. Folio with numerous plates. is, 1875~ 
VOL, XVII.—No. VII, 58 
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