Our Astronomical Column

Abstract

OBSERVED CHANGES ON THE SURFACE OF MARS.—During 3iis observations of the Martian surface on April 19, 1903, Mr. Lowell, of Flagstaff, was surprised to see that the colour of the Mare Erythraeum was a decided “chocolate-brown,” whilst the neighbouring Syrtis was of the normal “blue-green.” Although the sea was similarly situated for observation on March 22, this peculiarity was not seen then, therefore the change must have taken place somewhere between these two dates.