302 Notes on the Aspect of Mars in 1882. 
sively sharp outline. On April 7, the northern snow was brilliant, well-defined, 
lenticular in form, and bordered by a narrow dark band, widest at the preceding 
(western) extremity. The southern snow spot proper does not seem to have been 
visible either to Signor Schiaparelli or to the writer,* the white spots occasionally 
seen in the neighbourhood of the south limb by the first observer, having been 
identified with the bright spots designated as Thyle I. and II., Argyre I. and IL, 
Novissima Thyle, and Hellas (Lockyer Land). Hellas seems to have been seen by 
me as a white space close to the south limb, on March 10, 11, and 13 (PI. 38). On 
March 11 (PI. 38), it contained an excessively minute and brilliantly white point. 
Japygia (Hirst Island) and the Yaonis Regio also contributed to increase the 
number of bright spaces seen. 
Other White Spots.—Besides the brilliant points and areolz seen constantly or 
from time to time near the north and south points of the limb, several possessing 
similar characteristics were observed within the Martian tropics, with one exception 
only, in positions where spots and markings of the same kind had beer noted by pre- 
vious observers. On March 8 (Pl. 38), between 8" 28™ and 8" 40" G.M.T., a white 
lenticular space was observed, probably identical with that found by Schiaparelhi, 
Knobel, and others to occupy the whole ora great portion of the region desig- 
nated Elysium (Fontana Land) on the Milan chart; but on this occasion the white- 
ness was seen when the region was near to the west limb before sunset. A smaller 
and seemingly better defined white spot was detected on March 11 (PI. 38): it 
is probably identical with that shown on March 13 (PI. 38), as lying close to the 
northern extremity of Hesperia (Burchardt Land), and is possibly connected with 
the white streak shown by Mr. Green as bounding the north-eastern side of 
Hesperia, although probably seen as a separate spot for the first time on March 11 
and 13 (Pl. 38). North-east of this white spot, another and less conspicuous one, 
identifiable with the Nix Atlantica, was visible on March 13 (Pl. 38). On the 
following side of the Syrtis Major (Kaiser and Dawes Seas) was, on March 11 (JEL 
38), a short white line, which lay somewhat obliquely to the coast line, touching - 
it with its northern extremity. This whiteness, seen also on the 13th March 
(Pl. 38), has been repeatedly detected at previous oppositions by several observers, 
and appears to be independent of the planet’s seasons, being well shown in Mr. 
Green’s drawings of 1873 and 1877, near to the summer and winter solstices of 
the northern hemisphere. 
The Dark Markings.—The Syrtis Minor was well seen on one occasion only, 
March 13th, and then had sensibly the same outline with that assigned to it in 
Signor Schiaparelli’s chart of 1879. From its apex there ran, meridionally or 
nearly so, a dusky streak, apparently of equable breadth (the Lethe), which 
reached to the dark Arctic belt shown in the sketch of this date. There was also 
* An additional reason for its invisibility to me was its proximity to the terminator and probakle_ 
immersion in the planet’s shadow at the several times of observation, if it had the same areographical 
position as 1: 1879. 
