1880. | : Recent Literature. 281 
GRENACHER’S RESEARCHES ON THE Eyes oF ARTHROPODS. — 
This is the most elaborate and detailed work on the eyes of in- 
sects and crustacea which has yet appeared. For the first time 
we have very full information given us as to the nature of the 
simple eyes (ocelli or stemmata) of larval insects and of Arach- 
nida, and we are here taught that they are much more compli- 
cated than was before suspected; so that they are not exactly a 
simple, elementary eye, as it were, a primitive form of eye, but, 
as the author claims, the simple and compound eyes stand in the 
relation of sisters, rather than of child and parent. 
A long chapter on the physiology of the compound eyes lends 
additional value to the anatomical portion. The author concludes 
that perception in the compound eye of Arthropods is effected 
in accordance with the theory first proposed by Müller, and that 
this applies to the compound eye of the horse-shoe crab (Limulus) 
although morphologically the eye of this animal is totally unlike 
that of any insect or crustacean. Grenacher does not describe 
the eyes of the myriopods, though he observes that the compound 
eyes of Cermatia are entirely unlike those of the spiders or insects, 
and that they seem to show some analogy to those of Limulus, 
The illustrations are abundant and simply exquisite, and worthy 
of the text. 
Darr’s METEOROLOGY oF THE PaciFic Coast Pitot.2—This is 
the results of several years’ examination by Mr. Dall into the 
meteorological features of Alaska, together with the data collect- 
ed from the publications of learned societies and from unpub- 
lished material in the archives of the U. S. Coast Survey, the 
Medical Department of the U.S. Army, and the U, S. Signal Ser- 
* U. S. Coast and Geodetic Survey. C. P. PATTERSON Superintendent- Pacific . 
: i A Second Series. Meteorology. Ao 
= "eran Acting Assistant U. S. Coast Survey. Washington, 1879. 4°, PP. 375 
plates. gE a e eH OEE ed 
VOL. XIV.—No, rv. 39 
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Grae, O 
