Lunar Photography

Frof essor .bangley has been interest ed for a considerable time in the possibility of preparing a chart of the moon by photography, which would enable geologists and selenographers to study its sur face in their cabinets with all the details bef ore thein which astronomers have at their command in the use of the most powerful telescopes. Such a plan would have seemed chimerical a few years ago, and it is still surrounded with difliculties, but it is probable that within a comparatively few years it may be suecessfully carried out. No definite scale has yet been adopted, bat it is desirable that the disk thus presented should approximate in size one two-millionth of the lunar diameter, but while photographs have been made on this scale none of them show detail which may not be given on a smaller one.