C. E. Burtron.-—Physical Observations of Mars. 
167 
B. M. Beer and Miidler. 
K. Kaiser. 
8. Schiaparelli. 
G. Green. 
D. Dublin, 1879-80, by Messrs. Dreyer and Burton. 
B. M.—D. K.—D. S.—D. G.—D. 
Marking. Long. Lat. Long. Lat. Long. Lat Long. Lat. 
Dawes Forked Bay, 5 FP 8 Ie =? TT 5° 
Beer Bay, 5 . = c= ss: —T 4. —)|65 5 
Lake north of Beer Bay, — — — — = = —— = 
North-west angle of Christie Bay, — = 4 13 @ —é 2 — 6) 
Schiaparelli Lake, : = —_ — — 15 4 3d 6 
Terby Sea, oo 4 —4 6 oo pil 9 2 
Bessel Lake, ~ _ — — oP et I) I 
Funchal Bay, . — — -— =H SH OSI = 
West angle of Canal from Trouvelot Bay, — = (Ge) — — 
Trouvelot Bay, 14 (uy) @) s —) xo}! ~~ 8 
Noble Cape, — — — — — — Sa 
Oudemann Sea, : — —_ — — —- AL 
West end of Conall orn Huggins 2D — — (10) (0) 12 (7) == — 
Hooke Sea, west end, — — - — — 8 — 4 (6) (7) 
Huggins Bay, ~ — — — -16 6 —16 2 
Burchardt Land, north end, — — (4) (2) 2 4 (3) (1) 
Middle of Canal from Gruithuisen Bay, _ — a _ 3 = % — == 
Kaiser Sea and Nasmyth Inlet, j a= — — — (3) (0) (3) (2) 
Hast end of Hind Peninsula, = — (5) (ll) — — (—15) (10) 
East end of Dreyer Island, — — — (ll) (-—7) (—18) (—2) 
Middle of Kaiser Sea, =ilil GO —Ab —Hl —. § —I% —10 0 
Dark patch in Dawes Ocean, . _- 15 1000 — — — — 
Middle of Nasmyth Inlet, _ — — — (—10) (0) 10 5 
Lockyer Land ae — —- — — —f— 2 = I 2 
Banks Cape, 1 5 i 3 Ae A. | eee 
— — — — a 6 = § 1 
Centre Phillips Island, 
Nomenclature.—In the preceding lists the nomenclature employed by Mr. N. E. 
Green, in his paper published in the Memoirs of the Royal Astronomical Society, vol. 
44, has been usually employed, as that which is, perhaps, best knownto workers in the 
British Islands who have devoted themselves to observation of Mars; based as it is on 
the system of names introduced by Mr. Proctor some years since, and adopted in his 
published charts of the planet. But, perhaps, I may be permitted to express an 
earnest hope that some system of nomenclature may be introduced which is free 
from the objections mseparable from a system admitting of the employment of the 
names of living persons, and shall serve naturally and conveniently to distinguish 
the several markings by designations as far as possible of a mnemonic character, 
recalling the characteristic features of the markings to which they are attached. 
NovTE ADDED IN THE PREss. 
It may be well to bear in mind the real minuteness of the differences recorded in the Tables given in 
the text. At the time of Mars’ nearest approach to the earth last autumn, the apparent diameter of 
his disk was about 20" (seconds of a) ang consequently one degree of a Martian great circle subtended 
to a terrestrial observer no more than 54°", or little more than one-sixth of a second of arc, when at the 
centre of the disk. 
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