OLservatious of the Coiiiet (T. 1850), made a t the Royal Ol~servatory, Calw ot Good Hope, between Sept. 6 and Oct. 15, 1850. By Z'homns Maclenr, Esq. 011 the 6th of October the comet resrnibletl a nearly circular nebula of about 5' in dianieter, with a considerable degree of tliKused Iiriglitness in .the centre. As the oli.ject Iiecanie faiut the dimensions increased, still retaining the circular shape ; and ori the 15th of October, whcri it was Isst seen, there was no increase of opacity towards the centre, nor anything to guide the judgement iii the nimsurenients other than the general form. The sky \vas covered oii the 16th arid 17th of October; al'terwartls the comet could Itot hc detccted.
The observations were niatle Iiy niyeelf with tlie 8i-fucit equatorial. armed with its spider-line po4tioti micrometer, arid powe:. 123. tlie lowest that Iic~loitgs to the niicronieter. The distances between the brightest part of the comet arid the most conveiiient star in the field with i t , were nieasured in polar distance, and parallel to the ecltrator, Iiy the micrometerscrew, einployiiig the driving-clock : iiritl each recortietl result is iri geiict;il tlic nieaii of tcii partiti1 nieitsiires. The stars were afterivards cibserved with tlic? iticridiari iristruriieiita, but tbc smaller stars were not so acciiratdy ol,srtvc-tl in iiglit ascensiclrt ;is i i i polar tlistaitce. Cilpc 1 * j 0 lleaii T i m e .