ON MAPriNG THE SURFACE OF THE MOON. 



31 



Table II. 



Estimations and measures of the diameter of the small crater reduced to 

 29° 54' 40'' = angular distance from the moon's centre. 



Opintons. 



In the preceding parts of this Appendix facts (as given by observation) 

 only are mentioned. Since Schmidt's announcement of change several 

 opinions have been expressed on the phenomena observed. It is manifestly 

 desirable to avoid hazarding an opinion until the observations on the one 

 hand have become sufficiently numerous to afford a solid basis on "svhich to 

 found a conclusion, and on the other have been so arranged and discussed 

 that that conclusion may itself partake of the nature of a more general fact. 

 Nevertheless, as the opinions that have been published may assist (in 

 connexion -with the observations) in arriving at a safe and general conclusion, 

 they are given in. the order in which they refer either to the early or recent 

 observations. 



Opinions of the White Spot in Schroter's time. 



For Schroter's description of the spot v, see ante, pp. 3 and 4. 



Mr. HuGGiNS seems to regard this description as closely agreeing mth the 

 appearance of Linne at the jiresent time, with the exception of the interior 

 crater. — Monthly Notices, vol. xxvii. p. 298. 



Professors D'Arrest and Schjellerup agree with Mr. Huggins. — Astro- 

 nomische Nachrichten, No. 1655. 



Schmidt. "Der kleine Crater v daselbst entspricht am n'dclisten dem Orte 

 des Linne." 



Translation. — The small crater v corresponds nearest to the place of Linne. 



Eespighi. " II est positif que Schroter, dans ses SelenotopograpMsche 

 Fragmente, Table IX., represente cet objet avec une tache blanche, d'un dia- 

 metre presque egal a celui du cratere de Sulpicius Gallus, avec la trace d'un 

 petit cratere, tel qu'on I'observe maintenant, et nou comme quelques unsl'ont 

 affirme, sous la forme d'unc grande tache noire ; il est positif que le cratere 

 a des dimensions a peu pres egales a celles que lui assigne M. Schmidt lui- 

 meme, c'est-a-dire environ quatre milles de diametre." — Bulletin Meteorolo- 

 gique de I'Observatoire du CoUege Remain, 31 Mai 1867. 



Translation. — It is positive that Schroter, in his Selenofopographiscke Frag- 



* The orifice of the crater. 



t The base of the cone. 



