328 Scientific Intelligence. 
On Monday it was ascertained that on Saturday evening several in- 
dividuals had noticed in the north a bright streamer, rising to a great 
height above the horizon, and it was at once concluded that this was the 
tail of the same comet. The daily newspapers report, that the head of 
the comet was seen on Saturday evening at Columbus, in Ohio; but it is 
not known that any une made any accurate determination of its place. 
On Monday night, at New Haven, the sky was overcast ; but on Tuesday 
evening, July 2d, the sky was mostly clear, and the comet very conspi- 
cuous ; although it was thought that its head was not as brilliant as it had 
been on Sunday evening. At 9" 31™Pr.m., the position of the head was 
in R. A. & 41", and Dec. 63° 5’ N. Seen through a telescope of five 
inches aperture, with a power of 55, the head was fully thirty minutes in 
diameter. Near the centre of the nebulosity appeared a very brilliant 
nucleus, from which emanated a luminous sector, whose opening was 
about 90°, one side being nearly vertical, and the other or right side was 
nearly horizontal. This brush of light extended two minutes from the 
nucleus. The tail of the comet could be traced to a distance of 90° from 
the head. 
On Wednesday evening the sky was again clear, and the comet was 
observed to great advantage, but its brilliancy had palpably declined 
since Sunday evening. At 9" 5" p.m., its head was in R.A. 9" 52™, and 
Dec. 60° 10’ N. Seen through the telescope, the coma had about the 
same extent as on the preceding evening, but the luminous sector already 
mentioned had changed very noticeably. The sides of the sector were 
curved, the concavity being outwards, and the opening of the sector 
amounted to 186° when measured to the extremities of its are; but the 
initial directions of the two sides formed an angle at the nucleus of about 
90°. From the nucleus to the edge of the sector was 1’ 34”. Beyond 
this, there was a dark arch or band concentric with the nucleus; and be- 
yond the dark band a luminous arch or envelope, faint and misty, the 
middle line of which was 2’ 52” from the nucleus. Beyond this there 
were faint indications of a second envelope, with an intervening dark 
arch, the whole forming a series of nearly concentric light and dark 
arches, similar to those observed in Donati’s comet in 1858, and in Hal- 
ley’s comet in 1835. The tail of the comet on Wednesday evening could 
be traced through an arch of 95°; and the deviation of its axis from the 
position of direct opposition to the sun was about 12°; and toward the 
east the axis produced cuttin ;the ecliptic about 8° behind the sun’s 
place. 
The tail of the comet was carefully observed on several clear evenings, 
but the observations were more detailed and complete on the evening of 
July 3d. The northern edge grazed the star Lambda Draconis, passed 
about 15’ to the south of Kappa Draconis, and continued on through Jota 
Draconis, and far beyond it, in an are of a great circle. The southern 
edge passed just to the north of H. 32, Urse Majoris, grazed H. 30, 
Urse Majoris, and continued on through the stars 3 and 8 Draconis. 
(According to the B. A. Catalogue, these stars are Nos. 3496, 3358, 3968, 
and 4347.) 
It broke off, or suddenly became faint, before it reached the distance of 
Alpha Draconis, at about 20° from the nucleus. From that point the tail 
continued as a much fainter milky band, decreasing very gradually in 
luminosity, and varying but little in apparent breadth. This breadth 
was less than one-half the breadth of the extremity of the brighter por- 
tion, which was about 3°. The southern edge of the narrower and fainter 
stream passed through Alpha Draconis, and grazed the stars Tau, Sigma, 
and Kta Hereulis. ‘The decreasing light of this stream vanished in the 
immediate vicinity of the Milky Way, to the east of 6 Ophiuchi. The 
