C. E. Burron.—Physical Observations of Mars. 157 
the greatly increased distance of the planet on Dec. 24, present the aspect of a 
general faint shading over the whole region traversed by the interlacing lines. 
The slightly diminished instrumental power employed on Dec. 24, would contribute 
to produce the effect observed. I find a note in the observing book to the effect 
that “vision” was “ excessively difficult.” Definition improved afterwards. 
No. 9. Longitude=113° 1879, Dec. 24. 6% 10™ to 6" 23™ G.M.T. 
The remarks on No. 8 apply also to this drawing, but one or two details had 
become visible which were not seen before. The principal of these is the bay to 
the east of that described under No. 8, probably Pratt Bay (Green). Three white 
spots were seen at the limb, two at or near to the poles, the third at position angle 
280°+ 10°. 
Two faint dusky stripes were suspected to originate from the points of the two 
seeming bays, and to cross the equator into the northern hemisphere. 
Instrument used for Nos. 8 and 9 ; the 6 in. achromatic, with a power of 270. 
No. 10. Longitude=114°. 1879, Nov. 22. 11> 1™ to 11° 30™ G.M.T. 
A much larger amount of detail is here shown than in No. 7, taken an hour 
and twenty minutes previously. Definition had improved, and was at times 
extremely hard and sharp with power 270 on the 8 in. refleetor, and the beauty of 
the image was such as it has rarely been my good fortune to witness. The sketch 
was considered on the whole to be very faithful, and an exceptionally high value has 
been attached to it on account of the favourable circumstances under which it 
was made. 
The Terby Sea was undoubtedly rhomboidal in form, and was nearly surrounded by 
what appeared to be a system of interlacing streaks connecting it on the south 
side with various portions of the De la Rue Sea, and on the north with an almost 
continuous streak which joined Christie Bay with Pratt Bay or its neighbourhood. 
Near the middle of the last-mentioned streak, at its confluence with a minute dusky 
stripe connected with the Terby Sea, I detected a very minute ‘lake,’ which seems, 
however, to be too far to the north to be identified with Bessel Lake (Green). The 
bay to the south of Bessel Lake is very dark and distinct. I venture to propose 
for it the name of the Bay of Funchal in remembrance of Mr. Green’s labours at 
Madeira. 
Lagrange Peninsula was on this occasion as on all others, quite invisible. The 
northern snow spot was at this time very faint, and none could be detected with 
certainty at the southern limb. Schiaparelli Lake well seen. 
In the drawing the shadings east of Funchal Bay should be somewhat nearer 
to the Terby Sea.* 
* The coast line east of Funchal Bay was very sharply defined. 
