Smithsonian Report, 1 903.— Shaler. 



Plate X. 







I 



Mare Tranquilitatis and Surroundings. 



Photosrapheil \>\ Kitflifv. August H. VA)\. 'l liours :» minutes a. m., Ofiitral stniidanl time. Exposure, 



three-fourths .second. 



