relating to the Mountains of the Moon. 5 1 1 
“ tria milliaria Italica : quae eft vera, et genuina altitudo 
“ iftius montis.” As a German mile in the time of he- 
velius was a very uncertain meafure, we may fuppofe 
that he meant geographical miles, 15 of which make a 
degree of latitude. The obfervations of hevelius have 
always been held in great efteem ; and this is moft pro- 
bably the reafon why later aftronomers have not re- 
peated them. M. de la lande, who is one of our moft 
eminent modern aftronomers, agrees to the fentiments 
above cited. 
In his Abrege d ? AJironomie, p. 435. he fays, u Je ter- 
“ minerai ce qui concerne la felenographie, en difant un, 
“ mot de la hauteur des montagnes de la lune, qui etoient 
“ quelquefois eclairees, quoiqu’ eloignees de la ligne de 
s< lumiere de la treizieme partie du rayon de la Lune ; de 
“ la on peut conclure que ces montagnes ont de hauteur 
“ la 338 Itme partie du rayon Lunaire, ou une lieue de 
“ France. He then gives us a particular calculation, and 
the refult is : “ Avec ces donnees on trouve la hauteur de 
“ 2643 toifes, e’eft a dire, plus d’une lieue commune.” 
He alfo mentions the opinion of galileo, and adds : 
“ Mais on doit preferer a cet egard les obfervations 
“ d’HEVELius, qui ont ete plus repetees, plus detaillees 
64 et plus exa<ftes,” 
