Smithsonian Contributions to Knowledge, Vol, XXXIV. 



Plate XXIV. 



ARISTOTELES, EUDOXUS, AND SURROUNDINGS. PHOTOGRAPHED BY RITCHEY, OCTOBER 13, 1900, 



TWO HOURS FORTY AHNUTES A. M. EXPOSURE, ONE-HALF SECOND. SCALE, 



THREE-FOURTHS METER TO MOON'S DIAMETER. 



