4 REPORT — 1SG7. 



einer fast dicht an den siidlichen Griinzgcbirgen befiadliehen, verhiiltlicli 

 gezeichneten Einscnkiing a, streiclit nordlich iiauh v, wo seJhst sie wleder erne 

 olingefdhr r/lelch grosse, aher ganz fiache, ah ein iveisses, selir Ideines rundes 

 Fleclcchen erscheinende, etwas ungewisse Einsenlcimg in sick ]uit.'"[ 



Translation. — The sixth ridge comes from a depression u, situated almost 

 close upon the south boundary mountains, passes northwards towards v, wliere 

 it again has within it a somewhat uncertain depression of about the same size, 

 hut quite flat and resembling a ichite, very small round spot. 



(b). Schmidt's Reference to 8chkoter's Observation. — " I. Schroter, 

 5. Nov. 1788, Abends, beriihrte die zunehmende Phase den Ostrand des 

 Mare Serenitatis, so dass die Berge des Caucasus und der nordliche Apennin 

 schon erleuchtet -waren. Schroter beobachtete diesmal mit 95-maliger 

 Vergrosserung des siebenfiissigen Reflectors. Seine Abbildung vom 5. Nov. 

 ist Tab. IX., Band I., der Selenotopograpbischen Fragmente. Der kleine 

 Crater v daselbst entspricht am ndehsten dcm Orte des Linne, keineswcgs aber 

 y, der jetzt noch sichtbar ist, und noch weuiger der dunkle Fleck g." 



Translation.— 1. Schroter, 5 Nov. 178^, in the evening, at the increas- 

 ing phase, the terminator was in contact with the eastern boundary of the 

 Mare Serenitatis, so that the mountains of Caucasus and the northern 

 Apennine were already illuminated. Schroter observed this time with a power 

 of 95 on the 7-foot reflector. His drawing of 5 Nov. is in Tab. IX. vol. i. 

 of the Sclenotopographic Fragments. The small crater v in it corresponds 

 nearest to the place of Linne, y (which is now still visible) not ac aU so, and 

 still less the dark spot g. 



Note. — In the Monthly Notices R. A. S., vol. xxvii. p. 298, Mr. Huggins 

 has italicized the portion of Schrciter's observation of the spot v. In Schmidt's 

 reference I have italicized the word " niichsten"' (nearest). Schmidt does not 

 appear to have identified v with Linne (sec post, p. 21). 



2. Lohriiann's Observation.— 1823, May 28, 2" 12"' to 2" 15™ Morgens, 

 Wahre Dresdner Zeit (Topographic der Sichtbaren Mondoberfliiche, p. 92): — 

 " A ist die zweite Grube auf dieser Fliiche .... neben einer von Sulpicius 

 Gallus herkommenden Bergader, hat eincn Durchmesser der etwas mehr 

 als eine Meile betriigt, ist sehr tief, und kann in jeder Beleuchtung gesehen 

 werden." 



Translation. — A is the second crater upon this plain .... near a ridge 

 beginning at Sulpicius Gallus, it has a diameter of somewhat more than a 

 mile, is very deep, and can be seen under every illumination. 



Lohrmann's Note to his measure of A (Topographic der Sichtbaren Mond- 

 oberfliiche, p. XV of Observations): — " Conon kann zur Zeit des VoUmondes 

 nicht deutlich gesehen werden ; dagegen zeigt sich A immer als heller Punkt 

 im grauen Mare Serenitatis." 



Translation. — Conon cannot be seen distinctly at the time of the full moon, 

 whilst A shows itself always as a bright point in the grey Mare Serenitatis. 



3. Beer and Madler's Measures. — 1831, Dec. 12 and 13. Extract from 

 a letter of Professor Miidler in English, dated 18G7, June 6. 



"The crater Linne, situated in 27° 47' 13" N. lat., and 11° 32' 28" W. 

 long., has a diameter of 1-4 geographical miles (6-4 English miles). In full 

 moon the edge of it is not very sharply limited, but in oblique illumination 

 it is very distinct, and I have measured it seven times with great facility. 

 The light of the edge is noted permanently 6° ; the very small inner space 

 has nearlj', or full the same brightness till the moment when shadows begin." 

 4. Schmidt. — IJber die gegenwiirtige Ycriinderung des Mondcraters " Linne." 

 Sitzungsberichte der K. Akademie, Wien, Bd. Iv. Feb. 1867. 



