COMETS. 



almost centrically over a star of the tenth magnitude, without in 

 the slightest degree affecting its apparent brightness. The star was 

 distinctly seen through the densest part of the comet. Another 

 transit of a star took place with a like result. 



Annexed is the scale according to which this drawing has been 

 made. 



10' 



10' 



20' 



30' 



40' 



50' 



MJIJllilj 



90. The comet changed not only its magnitude and form, but also 

 its position, after September 29. On that day the direction of the 



tail was that of the parallel of 



Fig. ii.-Oct. 8, 18.35. declination through the head. 



On October 3rd it was inclined 

 from that parallel towards the 

 north at a small angle, and, 

 instead of being straight, was 

 curved, as shown in fig. 10 

 (page 199). The diameter of 

 the head was increased in the 

 ratio of 2 to 3, and the length 

 of the tail in the ratio of 

 nearly 1 to 3. 



91 . On the 5th, 6th, and 7th 

 the comet underwent several 

 changes : the nucleus became 

 more conspicuous. On the 6th, 

 a fan-formed flame issued from 

 it, which disappeared on the 

 7th, and re-appeared on the 8th with increased splendour, as 

 represented in fig. 11, which is drawn on the subjoined scale : 



10" 0" 



20" 



40" 



60" 



80" 



100" 120" 



I I I 



The nucleus appeared like a burning coal of oblong form, and 

 yellowish colour. The extent of the flame-like emanation was 

 about 30". The feeble nebula surrounding the nuclei extended 

 much beyond the limits of the drawing, but, being overpowered 

 by the moonlight, could not be measured. 



92. The comet as it appeared on the following night is shown 

 in fig. 12, which is on the same scale as fig. 11. The nucleus and 

 flame-like emanation entirely changed their form and magnitude 

 200 



