t 
Physies. 317 
We showed also that the two species were related in chemical 
composition, although taere was a wide variation between the 
results of analysis in the two cases, the formula of eosphorite 
being clearly established, while that of childrenite was still in 
he analysis of Mr. Penfield seems to set at rest the 
latter question and to show further that the two species have 
the same formula, but differ in this: that childrenite contains 
chiefly iron (26°54 FeO, 4°87 MnO) and eosphorite chiefly man- 
ArT. XL. — Observations on the Planet Lilaea; by Professor 
C. H. F. Perers. (Communication to the Editors, dated 
Litchfield Observatory of Hamilton College, Clinton, N. Y., 
March 6, 1880.) 
_ OF a planet detected on Feb. 16, I communicate the follow- 
ing observations, all that have been hitherto obtained. 
1880. Ham. Coll. m. t. a (213) 6 (213) No. of comp. 
Feb. 16. 14) 30mp 9s 16451™44°°51 +13°16°7"2 15 ringmicr, 
Feb. 18, 11 29 13 10 50 17°35 13 29 186 3 ringmicr 
Feb. 19. 14 26 54 10 49 23°97 13 37.126 —-12 ringmicr, 
Feb, 27. 8 26 29 10 43 4°67 14 30 47-2 —«:10 fil. mier, 
Mar. 2. 9 239 10 39 43°29 14 57 262 —10 fil. micr. 
The observation of Feb. 18 is a very indifferent one, and, 
besides, the comparison star of that day is only approximately 
determined in zones. The planet appeared of the 11th magni- 
tude. It has received the name Zilaea. 
SCIENTIFIC INTELLIGENCE. 
I. PHysics. 
1. Photoyraphs of Star Spectra.—Mr. W. Hueerns in a note 
