156 Scientific Intelligence. 
quartz san ains about. Noticing the latter, he made some 
comparative measurements, and found that the Navicule would 
ove grai ch as twenty-five times their own 
: J; GrorGE Mivarr. Nature 
series. Macmillan & Co., 1874.—This little treatise contains not 
only a large amount of information concerning the comparative 
anatomy of frogs, but also numerous illustrations of the anatomy 
of other animals, and of man, introduced for the sake of compat 
son with the corresponding parts of the frog. It is illustrated by 
eighty-eight cuts, most of them excellent. bdo 
24. Animal Mechanism: a Treatise on Terrestrial and Aerial 
Locomotion ; by E. J. Marry. With one hundred and seventeen 
of the numerous mechanical contrivances by which the wing® 
_legs, and bodies were made to record their own motions. M 
of the tracings are reproduced in the cuts. Several machine 
so constructed as to imitate faithfully the essential motions 40° 
effects of the wings of insects, are described and figured. The 
tire subject is so well explained and illustrated that the book pees 
not fail to be interesting and instructive, even to non-scient 
readers, v. 
