“It could not have been made more conspicuous,” I replied, “for the situation of the great ring mountain called Copernicus, in the midst of an immense level expanse, makes it one of the most marked features of the lunar world. Copernicus is the subject of one of the larger photographs that we are going to examine later, and I reserve a description of its peculiarities. North of Copernicus you will observe apparently a continuation of the _Mare Nubium_. But it is really another ‘sea’ that we are looking upon there, the _Mare Imbrium_, ‘Sea of Rains.’ The baylike projection that runs out into the bright highlands west of Copernicus bears the name of the _Sinus Medii_, ‘Central Gulf,’ and the one just below it is the _Sinus Æstuum_, ‘Gulf of Heats,’ which is certainly suggestive of dog days on the moon. Observe that the _Sinus Æstuum_ merges on the west with a dark, oval area, which is called the _Mare Vaporum_, ‘Sea of Mists.’ It is one of the darkest districts on the moon. If you will now turn the photograph upside down you will find that the _Sinus Medii_ constitutes the dark eye of the Moon Maiden, while the _Sinus Æstuum_ and the _Mare Vaporum_ form that portion of her hair which droops upon her forehead.” “Why not frankly call it frizzed?” “Because I feared that you would not consider that a sufficiently poetic term.” “But I find poetry enough in the names ‘Gulf of Heats’ and ‘Sea of Mists.’ My admiration for the man who could think of such appellations continually increases.”