116 
night it occurred to me after leaving the observatory that the 
axis of the tail was not exactly in the direction of the comet’s 
radius vector, and to-night I found its angle of position at 
13h. 35m. sidereal time to be 96 - 7°. At this time the 
position of the sun and comet were — 
The sun R.A. 42° 54' — N.P.D. 73° 33'. 
The comet... R.A. 144° 50' — N.P.D. 48° 43'. 
From these data we find that the angle of position of a pro- 
longation of the comet’s radius vector was 69‘9°. The 
apparent deviation of the axis of the tail was therefore 26 , 8° in 
the direction of the comet’s motion. 
May 7th. At 12h. G.M.T. the comet appeared to the 
naked eye to be nearly equal to fx Leonis, and equal to, if not 
brighter than, 38 Lyncis. 
May 9th. Three comparisons with Lai. 17,987 gave the 
comet’s apparent position at 9h. 57m. 30 - 5s., R.A. 9h. 3m. 
23-25s. Dec. + 26° IP 26*1". 
At 13h. 15m. sid. time the angle of position of the axis of 
the tail was 1 03*2°. At this time the angle of position of the 
comet’s radius vector was 7T5°; the deviation therefore 
amounted to 28 - 7°- 
With the 5-inch achromatic the tail appeared to be half a 
degree in lengtn ; but with the 13-inch reflector it was fully one 
degree, though fainter than when last observed, and still much 
less in breadth than the diameter of the head. The average 
diameter of the head was about 20', but the nebulosity 
extended farther on the south preceding side of the point of 
greatest condensation than on the north preceding or north 
following sides. There was still an entire absence of any 
stellar nucleus. To the naked eye the comet appeared as a 
star about equal in brightness to fi Leonis. 
May 14th. Notwithstanding the moonlight, the comet 
was still visible to the naked eye, and in the 5-inch achromatic 
with a power of 68 it was about 10' in diameter. The tail, 
however, could not now be seen. 
