“ For sixteen years he had conducted the Nachrichten with signal ability; maintaining its high character as a center for astronomical research and information of the highest order, and even raising, whenever possible, its tone of scientific dignity, impartiality and judicious discrimination. ”

“ Krueger has filled the important position thus assigned him, is well know to astronomers. He has brought to his task a critical acumen, a judicious tact, and a kindly spirit, - a combination which has result to the advantage of astronomy in many countries. ”