380 NATURAL HISTORY MISCELLANY. 
absorption of the gas which they use in the manner of a float or air- 
bladder. The air-bubbles are not connected with the contractile vacuoles, 
or with the nuclei les it is important to observe, do no 
occur in on-granular protoplasm of the pseudopodia, but in the 
granular substance, and a t spherical but of an irregular for hic 
as Dr. Engelmann observes, proves that the protoplasm is not in the con- 
dition of aggregation of i he mical composition E 
hus so remarkably developed by the Arcell@ was not det mined, nor the 
mechanism (if any exist) of the formation and disappearance ir- 
he discovery is of importance from two points of view: in t 
first place, for the development of gas in protoplasm a ysiological 
this development, of which this exceedingly simple organism makes use 
for the purpose of locomotion.— Quarterly Journal of Science. 
THE LARGEST INFUSORIUM KNOWN. — In the “Institut” of the 24th of 
January is an interesting paper on the Gregarinads, which are well known 
to represent one of the simplest forms of animal life, Sonea of a nu- 
n 
lately discovered a remarkable form, to which he ep VEDI the name 
Gregarina gigantea, in the intestine of the lobster. It has been subjected 
to M luge and Schwann of the Académie Royale de Belgique for ex- 
amination, and they report that its length is no less than 16 mm., and its 
r 
is occupied by a viscous liquid containing granular particles, with a nu- 
cleus and nucleolus. This last exhibits a remarkable phenomenon. At 
first it is single, but in the course of a few seconds the nucleus oe 
to be filled with a large number of small refractile idis which a 
so many nucleoli. Some of them then augment considerably in size, 
whilst the primary nucleolus gradually disappears. "o the exception 
of the yolk of the egg of birds, and some other ^ the Gregarina 
gigantea constitutes the largest known cell. — The Aca my 
ANTHROPOLOGY. 
Auonidik ut RELIC FROM TRENTON, NEw JERSEY. — In the ‘“ Proceed- 
ings of the Academy of Natural Sciences of nade and in local 
papers, we have frequently called attention to various large deposits of 
arrowheads, axes, etc., and to interesting isolated specimens of curi- 
