82 Scientific Intelligence. 
examination, to be distributed in the interior Of each cell through 
the mass. Mr. Collins supposes that the tin was introduced by 
means of the fluoride. 
13. Microlite from Amelia County, Virginia.—The rare species 
microlite, hitherto known only in minute crystals from Chester- 
field, Mass., Branchville, _ Uti, Sweden, has been ee 
of. W. M. Fo 
characters are: H.=6 or a goich e8s ; & 5 "656; luster fh dee 
resinous; color, wax ye ellow o brown; stre k, pale ochreous yel- 
low; sub-translucent; pie colebokiat: very brittle. An analy- 
sis gay 
oe he Cb,0; WO; Sn0, CaO MgO BeO U.0s Y203 
68°43 174 0°30 E06, 21:30. VOL. 034 1°59 0°23 
Ce.Os, Di.O; Al.Os Fe,03 Na,O K,O F H,0, deduct 
0°13 0°29 2°86 0°29 2°85 1.17 
O17 
O replaced by F 
r 05 
This shows the mineral to be essentially a calcium pyrotanta- 
late, The formula deduced is— } (ni Wo,) TObOF,. 
eg Chem. bekig ili, 130, May, 1881. 
Mya arenari aay paper in the American Naturalist for 
way last , by R. E. C. Stearns, ri a that this mollusk, the “long 
clam” of eastern waters, has recently become the “ leading clam” 
in the markets of San Francisco sah Oakland, although unknown 
on the coast until the discovery of a few specimens on the eastern 
side of ae bay in 1874. How introduced is yet an unan- 
swered questio “ 
15. Eentoopods. the food of some young Fishes.—Dr. Leidy 
reports that the young of some of the su ys ED oaeticar gy ¥ 
b ki 
III. Astronomy. 
1. On the Figures of the Planets.—The conclusions. of f Pro- 
fessor Hennessy in PPh orb to the form of the planet Mars have 
n given on p. 162 of the last volume of this Journal (Feb. 
1881). Ina sf eet in the Comptes Rendus (1881, p. 225) 
