Astronomy. 325 
The third volume contains the following ew gfe The 
Uranogenital system of the Amphibia, by PRENGEL, 
114 pages, with 3 folded plates; Strobilation. ‘and abt ion 
in articulate animals, with special reference to the e homolog es 
between Vertebra ates, Annelids, and Anthropods, by C. Sempxrr, 
290 pages, with 12 folded plates; Studies on the Tarbellaria (on 
the Plathelminthids) by Cuartus SeDG@WIcK Mrnor, of Boston, 62 
pages, with 5 plates; on eng saliva and cement glands of the Deca- 
pods, by Dr. M. Braun, 8 een me with 1 plate; Remarks on the 
* Nephrofnensten” of v. ate ing, by C, SEMPER. 
On the Brain of Chimera monstrosa, by B. G. WiLpER, 
Proc Acad. Nat. Sci. Philad., May 29, 1877. 34 pp. 8vo, with a 
plate. 
IV. ASTRONOMY. 
New Planets.—In a letter to the editors Prof. Watson says: 
“ The following are the places, from the observations — 
reduced, of the two planets recently discovered by me. 
Planet ( (174) discovered pre ais 8th, magnitude 10°3. 
Ann Arbor. Mean — 174)qa. sich = No. Comp. 
MA ite 
1877, Bache 8, be 50 0 21 22 39°10 mT 4 70 
s 21 13 57°94 1546 60 5 
; > 25 2113 5°89 1544 8:0 5 
18,1040 5 2112 0-29 1541348 § 56 
20, 11 1113 21 9 55°43 1536304 5 
26, 9 30 21 4 91 15 19 581 5 
30, 12 15 30 21 0 33°55 15 2 
Sept. 1, 948 4 2059 3°24 1621 279 9 
a; 20 57 34°90 14 54 53 5 
Planet (175) discovered September 2d, re Ne 11°5. 
Ann Arbor. Mean — (175)a. (175)d. No. Comp. 
h m i ee 
1877, Sept. - a 2 58 2310 4°80 +0 44 59°71 5 
3 50 35 23 9 58°39 0 44 50°2 5 
0 40 9 23 9 10°38 0 43 36°9 6 
11 56 23 8 16°21 +0 42 11°3 5 
wrens Ann — September 10, 1877. 
Rotation of Saturn.—Professor Haxx discovered on 
thie anlght of December 7th, a bright spot on the ball of Saturn, 
at Poughkeepsie, Albany, Hartford, ets. The spot was followed, 
and its} baton famed at hay (es Sie sire Jan. 2d, or through 
an sixty 
min 
proper motion on the surface of Sa shia Evan Hall obtains for 
the time of one revolution on its a 
10" 14™ 93° . ie 2°-30. 
The only earlier determination of this quantity was made by Sir 
m. Herschel in 1793-4 who found it to be 10" 16™ 0%-4, which 
he ‘belienea could not be in error as much as two minutes. By a 
curious mistake his time for the rotation of the ring, or 10" 29™ 
16*-8, has been hitherto given in almost all treatises on astronomy 
as the time of rotation of the planet itself. 
