294 Scientific Intelligence. 
one and a half minutes of space apart. Each portion presented the 
usual characteristics of a telescopic comet, being gradually condensed 
towards the centre, without any well defined disc; each having a tail 
‘extending from the side opposite the sun. 
The following are Santini’s elements of this comet, as given in 
Schumacher’s Ast. Nach., No. 491. ; 
Perihelion passage, 1846, Feb. 11.40127 M. T. at Padua. 
Longitude of perihelion, 109° 4/ 29’"11 Mean equinox 
Longitude of node, 245° 517’ 24”-46 § of Feb. 11, 1846. 
Inclination, 12° 35! 25°85 i 
Eccentricity, 49° 10’ 39’-98 ee 
Mean daily motion, 587653627 
Log. semi-axis major, 0°5463360 : 
The following ephemeris computed from these elements, is for 12h. 
mean time at Padua. 
| A. R. ' Dec. Log. dist. from sun. , Log. dist. from earth. | 
March 3 | 52° 7 | 8° 44S, -96 124 ~ 96312 
59 5 | 10 9-97253 9-6100 
33-4. 66089. 1.11 128 9-98500 9:5924 
15 | 74 44 | lv 19 9-99834 95802 
19 138 | 18 i1 001228 9°5748 
23; 91 56 | 13 48 0-02668 95766 
27 | 100 32 | 14 7 0:04128 9:5861 
108 52 | 14 0:05596 9-6026 
April 4 | 116 38 | 13 52 0-07058 9:6252 
123 47 | 13 27 0:08508 9°6527 
12 | 130 16 | 12 55 0:09936 96831 
16 | 186 4 | 12 21 11342 9°7162 
20 | 141 28 | 11 49 0-12814 9°7520 
241 145 54 | 11 15 0:14056 97846 
28 150 8 | 10 47 0-15402 98196 
May 2j| 154 18 | 10 24 0:16638 9:8513 
6 | 157 14 | 10 18) oO-176878 | 98861 © 
4. Report on the erection of a Depot of Charts and Instruments at 
Washington city ; by Lieut. J. M. Grtuiss, 1845.—A_ law authorizing 
the erection of a depot of charts and instruments for the navy, WS 
passed by Congress during the session of 1841-42. ‘The site selected 
is in the southwestern part of the city of Washington, on the north bank 
of the Potomac. The ground was excavated to a depth of 8 feet, for 
the foundations of the walls and bases of all the piers, except that for 
the great telescope, which is 9 feet below the surface of the ground. 
The central building is 50 feet square on the outside. It is two sto 
ries and a basement high, and is surmounted by a revolving dome 23 
feet in diameter. There are four rooms on each floor, separated by 
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4 
