38
THE MOON
In 1892 a small mare was observed at Arequipa[1] which apparently had never previously been described. It is of about the same shape and size as the Mare Crisium, but is rather lighter in colour. It is situated nearly due west of it 1C [1.1, 6.6], and is only brought into view under a favourable libration. It has recently been measured by Franz.[2] who proposes for it the name of Mare Marginis.
