THE PLANET JUPITER IN 1S69-70. 
135 
intervals in it, as if it had been double, and connected by wide 
transverse bands ; but too faint to be sketched. 
The North Polar Region , or that which appeared so in the 
disc in consequence of foreshortening, occupied a large portion 
of that hemisphere. It exhibited an uniform dusky streakiness, 
where change, if it occurred, would be greatly masked in per- 
spective. In the immediate neighbourhood, however, of the 
north temperate belt, frequent variations took place in a narrow 
luminous zone which usually divided it from the greyness of 
higher latitudes: sometimes this zone would be so darkened 
that the great north temperate belt would appear as the border 
of the dusky polar region ; at others two narrow bright zones, 
the north usually the smaller, divided by a thin grey belt, would 
make a conspicuous separation there. This thin belt at times 
(Nov. 6, Feb. 25, March 11) assumed some importance as a 
humble companion to its grand neighbour ; at others, from the 
dissipation of the zone on its north side, it would become the 
darker edging of the grey region ; and sometimes it was hardly 
perceptible. These changes were no doubt partly due to local 
action ; for instance, Feb. 25, the north of the two narrow zones 
had almost entirely faded in lh. 20m. : but the sides of the globe 
may have been different that came successively into view. 
This region was distinguished by another peculiarity — a 
feebler tinge of the same brownish-yellow so conspicuous in the 
central zone. I noticed this in the second observation of the 
series, on Oct. 19, when I fancied it did not reach the pole. 
Oct. 21, I imagined it more extensive ; and subsequently, when 
attended to at all, it seems to have been diffused over every- 
thing beyond the north temperate belt. It was never more than a 
slight tinge ; sometimes doubtful — especially of late ; frequently 
quite distinct ; the difference depending possibly upon the state 
of the weather or the eye. 
The South Polar Region , being more removed from sight, and 
more compressed by its own temperate belt, possessed little 
worthy of notice. Nov. 16, there was a feeble dusky streak there, 
as in fig. 1. Nov. 17, fig. 2 shows a streaky grey. But, on 
the whole, it was characterised by being brighter than the oppo- 
site pole, and of a cool neutral grey without any tinge of yellow, 
excepting on Dec. 11, when 450 made it slightly tinted in 
comparison with the bright white of the north temperate zone. 
A few general remarks may suitably close this series of ob- 
servations, which cannot be said to have added to our present 
knowledge of the planet, but may possibly be of some little 
use in future comparisons. 
Nothing was noticed tending to contravene the received 
opinion that the bright zones are of the nature of atmospheric 
