128 
rorULAR SCIENCE REVIEW. 
us so efficiently in the case of our closer neighbour Mars. It 
is fortunate, therefore, for the purpose of our study, that Jupiter, 
the nearest at once and the largest of that external group, pre- 
sents a disc so broad and so luminous as to invite examination 
-even with telescopes of moderate size ; and it may be hoped 
that a persevering scrutiny will produce some interesting result 
in the end. 
The instrument employed in the following observations is a 
Newtonian silver-on-glass reflector, with a speculum by With, 
of 9-J inches aperture. It is capable of separating 7 2 Andro- 
medae and yu, 2 Bootis, and showing steadily the minute comes 
of /l t Andromedae ; and its definition of Jupiter with a power 
of about 212 was always as satisfactory as the state of the air 
would permit ; the latter, I regret to add, was frequently such 
as to offer great and occasionally insuperable obstacles. It was 
very seldom that I attempted to employ a power of 450, but 
even when its definition was tolerable, the light was too much 
diminished to render it of service. I had no micrometer avail- 
able for such minute details, but trusted to the estimate of a 
tolerably experienced eye, accustomed to drawing as well as to 
observation. The series was commenced on Oct. 15, 1869, and 
continued till March 11, 1870; during which interval the 
planet was examined, though sometimes to little purpose, on 
forty nights. 
In order to render description more ready and intelligible, I 
have thought it allowable to assign, for my own purpose, and 
for the present season, names to the different features of the 
planet. I have called the brighter stripes, zones , the darker, 
belts. The central portion, which has recently exhibited such 
singular details, I have termed the equatorial zone ; its two 
dark borders, the north and south torrid belts; the two bright 
regions on either side of these, the north and south temperate 
zones, the latter being subdivided by a dusky stripe, which 
may be called the south subtorrid belt ; beyond these two zones 
respectively lie the north and south temperate belts ; and on 
the further side of these, the two polar regions. The analogy 
of which I have availed myself makes of course no pretension 
to accuracy ; but it will answer for present identification, if 
not for future recognition. A reference to the figures on the 
next page will exhibit these features to the eye. 
We shall now attempt a slight description of these regions in 
order, beginning from the centre of the disc. 
The Equatorial Zone , with the two Torrid Belts that en- 
close it. These boundaries w'ere always continuous, uniform, 
and of a grey tint, which probably under more favourable cir- 
cumstances might have been distinguished as “ deepened yellow 
or yellow-grey, or faint chocolate;” such, at least, is the note 
