$ 2 7 o, 271] Herschel and Schroeter 9 353 



presented by the various planets, and in particular studied 

 the visible features of the moon with a minuteness and 

 accuracy far exceeding that of any of his predecessors, and 

 made some attempt to deduce from his observations data 

 as to its physical condition. His two volumes on the 

 moon (Selenotopographische Fragmente, 1791 and 1802), and 

 other minor writings, are a storehouse of valuable detail, 

 to which later workers have been largely indebted. 



