326 Scientific Intelligence. 
3. The newly discovered satellites of Mars.—The announcement 
of this remarkable discovery made by Prof. Hall was too late 
but was given upon the third page of the cover. It is of such 
exceptional importance that we give in full Admiral ee Re- 
port to the Secretary of the Navy, dated August 21st. 
“Sir: the outer satellite of Mars was first observed by Profes- 
sor Asaph Hall, U.S. N., on the night of the 11th of August, 
served, and its motion was established d by observations extending 
thr rough an sated of two hours, during which the planet moved 
over thirty seconds of arc. The inner satellite was first observed 
on the night of August 17th, and was also discovered by Pro- 
fessor Hall. On Saturday, August 18th, the discoveries were 
telegraphed to Alvan Clark and sons, Cambridgeport, Mass., in 
order that if the weather should be cloudy at Washington, they 
at aaa wee Mass., and by the Messrs. Clark, at Cambridge- 
port. On August 19th the discovery was ¢ scuhmusiaated to the 
Buchanan Institution, by which it was announced to oe Ameti- 
can and European observatories in the — dispa 
Two satellites “of Mars discovered by Hall, at Washington. 
First, elongation west, August 18, eleven hours, Washington tim 
Distance er sec eg Period, thirty hours. Distance of 
second, fifty se 
It will be ao hereafter that the statement of fifty seconds as 
the distance of the inner one was erroneous. The observations 
hitherto made are as follow 
‘ na ie ee 
1877, Aug. 11, 14 40, p= 59°6 (2); i 45, s='0: 57 (2) Obs, aa 
16,114 lL. 
13 7, p= 11°9 (2).2..-222 $=80°83 ah “ Hall 
33 s=80-4 (1) “ Hall. 
17,16 2, p= 85°5 (2); 16 19, s==63°24 (3) “ Hall. 
18, 10 28, p=251-7 (3); 1018, s=82°93 (8) “ Newcomb. 
10 57, p= 244°5 (1); 11 5, s=81°6 (1) “ Harkness. 
11 50 6 (4); 11.57, 6 (4) Hall 
, p= 232'1 (4); 1439, s=81-04 (4) I 
19, 11 42, p=283°2 (2); 11 49, (4) “ Hall 
15 43, p= 2554 (8); 15 . : 81-37 (6) “ Hall 
20, 10 * p= 61°] (3); 1033, s=76-07 (2) “ Hall. 
11 57, p= 52°1 (4); 12 “y $= 59°93 (4). “Hall. 
The Second Satellite. 
h 
1877, Aug. 4 16 "6, p= 43 0 (2); 16 21, $=30" 81 (4) Obs., Hall. 
1 31, p=248°8 (2); 11 37, s=34-65 (4) H 
Wd } 25, p= 226'8 (2); 11 30, s=24-08 (2) “ Hall 
20, 13 15, p= 67-1 (1); 13 26, 31: ~ (3) 
13 56, 27-02:(4) -; “: > Halk 
14 22, p= 170 (est.); 14 22, ‘Auciie = (3) “ Hall. 
16 19, p= 250 (est.); 1619, e=15°15 (7) “ Hall. 
16 35, s=16-70 (7) “ Hall. 
