8 REPORT—1863. 
similar to that of the “ Kistner” of Beer and Midler as really to have been taken 
for it. Under these circumstances it becomes highly important to settle the 
nomenclature in this part of the moon by distinctly designating both formations, 
the larger the “ Mare Smythii,” the smaller “ Kistner.” 
The extent of this large plain—fifteen degrees of latitude and as many, if not 
rather more, of longitude, viz. 5° N. to 9° 30'S. latitude, and 80° W. to 95° W. (?) 
longitude—combined with its great similarity to the Mare Crisium, clearly entitle 
it to rank asa Mare. As it was first discovered and named by Schroter, it may be 
considered undesirable to disturb the existing nomenclature; and undoubtedly it 
would be taking an unwarrantable liberty to change the name, if Beer and Madler 
had given the dimensions and outlines on their map as left by Schréter. As it is, 
much confusion has arisen. The plain has not been identified with their delinea- 
tion ; a formation eastward of it has been regarded and published as “ Kastner ;”’ 
and the only way now to set the matter right is to distinguish the one from the 
other unmistakeably. Again, the name of “ Kistner” is but little known in this 
country, and is of mere local interest, while the name of “Smyth,” as the Rey. T. 
W. Webb remarks, ‘“‘is not merely of English but of universal celebrity.” It is 
therefore proposed to retain the name “ Kistner” for the smaller and more ancient 
formation, and to commemorate the rediscovery by designating the larger and more 
modern plain by the name of the gallant admiral who has contributed so largely, 
not only to the advancement of astronomy, but also to the pleasure of every practical 
astronomer, by the publication of his most interesting ‘ Cycle.’ 
The walled plain “ Rosse ” is situated in the south-east quadrant of the moon’s 
surface. It has hitherto been wnrepresented, and is one of the largest individualized 
localities on the lunar disk unappropriated. It was first noticed by Mr. Birt, on 
November 3, 1862; but its characteristics, boundary-walls, and distinct individual 
character were determined with the Hartwell equatoreal on the 27th of August, 
1863. Its selenographical coordinates are 53° to 60° S. latitude and 48° to 55° E. 
longitude, and it extends from the craters Zuchius and Segner on the south to 
Phocylides on the north. Its eastern and western walls are partly interrupted by 
two small but conspicuous craters, as yet wnamed. The surface of this walled 
plain appears, under a rather advanced illumination, to be very smooth and level, 
with the exception of a remarkable promontory stretching towards the middle of the 
enclosure. This walled plain has received the name of “ Rosse,” in honour of the 
nobleman who has so liberally contributed to the advancement of astronomy by the 
erection of one of the largest telescopes in existence at Parsonstown in Ireland. 
The “ Percy Mountains ” are a fine chain, extending from Gassendi to Cavendish, 
with some very interesting crater-openings on their summits. They have been 
named to honour the memory of Earl Percy, the late Duke of Northumberland, a 
well-known patron of astronomy and a munificent donor of refracting telescopes to 
the Universities of Cambridge and of Durham. They are now undera regular course 
of observation by Mz. Birt, both with the Hartwell equatoreal and the Royal Society's 
41-inch achromatic, which was lately voted to him by the Council. Selenographical 
coordinates 17° to 28° 8. latitude, and 41° to 53° E. longitude. 
“ Phillips” and “ Wrottesley” are two interesting craters adjoining the magni- 
ficent formations “Wilhelm Humboldt” and “Petayius.” The occasion of naming 
them, as well as the discrepancy occurring in Beer and Madler’s map, as compared 
with “Der Mond,” relative to “ Wilhelm Humboldt” and “ Phillips,” are fully 
detailed in the ‘Astronomical Register’ for November 1863, pp. 169 and 170. 
“Phillips,” which is nearly the size of Plato, has for its selenographical coordi- . 
nates 24° to 27° 8. latitude, and 75° to 80° W. longitude. It is marked “ Hum- 
boldt” on Beer and Miidler’s map, which is decidedly a mistake. The coordinates 
of “ Wrottesley ” are 23° 8. latitude and 56° W. longitude. 
“Chevallier,” named in honour of the distinguished astronomer and scholar, the 
Rey. Temple Chevallier of the University of Durham, is situated in the north-west 
quadrant of the moon’s disk. Between “ Atlas” and “ Messala” there are three 
craters, two of which are unnamed. It is proposed to designate the nearest to 
“ Atlas” “Chevallier ”’; its selenographical coordinates are 45° N. and 50° W. 
The crater “ Piazzi Smyth” is named, with the Teneriffe Mountains, to comme- 
morate “An Astronomer’s Experiment.” It is interestingly situated on a soft 
