C. Ei. Burron.—Physical Observations of Mars. 159 
sharply defined on the northern side, and faded away on the southern into the light 
ground there prevalent. There were some minute and indistinctly seen markings 
to the north of Pratt Bay. 
No. 14. Longitude=153°. 1879, Oct. 6. 11°5™ to 11 12" G.M.T. Trouvelot Bay 
is shown at mid-transit or nearly so. A remarkable system of interlacing dusky 
streaks diversifies the surface known as Secchi continent, slightly altered in form by 
the effect of rotation since No. 12 was drawn, but evidently identical with the 
similar system there depicted. Trouvelot Bay appears with a single point, there 
being no trace of Noble Cape (Green). 
Instrument : no record in the observing book, but I believe that the 6-inch was 
employed in obtaining both Nos. 12 and 14, with power 400. 
No. 15. Longitude=181°. 1879, Oct. 6. 12" 40™ to 13°20" G.M.T. Trouvelot 
Bay is shown near the W. limb, and Huggins Bay (Green), is appearing at the 
eastern. The north polar snow is faint, but the dark shade near it is narrow and 
distinct. Hooke Sea (Proctor), appears prolonged toward the W.S.W. by a narrow 
streak, probably a portion of Maunder Sea, the western end of which is not visible: 
Near Huggins Bay Herschel I. Continent is bordered with bright whiteness. 
The eastern portion of the streak system described under No. 14 is visible, and is 
joined by a streak * originating in the neighbourhood of Huggins Bay, represented 
in many later drawings. The 8-inch reflector was used, with power 270. 
No. 16. Longitude=190°. 1879, Nov. 13. 10"50™ to 11"10"G.M.T. ‘Trouvelot, 
Bay, close to the western limb, was on this night seen to terminate in a double 
point. The detection of this minute feature was probably due to the planet being 
much nearer to the earth than on Oct. 6. Noble Cape seemed to be of greater 
length than in Mr. Green’s map. Burchardt Land and Hooke Sea are just visible 
near the eastern (E) limb, and Oudemann Sea is plainly shown, connected with 
Huggins Bay by a faint undulating dusky streak. Another faint streak 1s shown 
in connexion with Trouvelot Bay (sce observations of Oct. 6). Maunder Sea is 
very conspicuous, and a minute bright speck was seen at the southern limb, and 
inserted in the drawing. Close to the western limb a bright space was seen. The 
north polar snow was white and sparkling. Definition at times very fine, with 
power 270 on the 8-inch reflector. 
No. 17. Longitude=211°. 1879, Nov. 11. 11°15" G.M.T. Drawn by Mr. 
Dreyer, with the ‘South’ Equatoreal of the Dunsink Observatory. In the absence 
of original notes accompanying this drawing, kindly placed in my hands by Mr. 
Dreyer for embodiment with my own series in the same manner as No. 1 was, I 
venture to draw a few conclusions from the sketch itself. There are distinct traces 
* Huggins Inlet (Proctor). 
Ip) 
