Edward F. Williams, Popular Science Monthly (1912)
“ With its history and with the character and acquirements of the men who from the days of Aristarchus of Samos had been scanning the heavens and penetrating into the secrets of the starry worlds, Humboldt had made himself thoroughly familiar. What would he have said had he been as familiar with the principles of astrophysics? More ready than ever, assuredly he would have been, to assert his belief that we are standing on the threshold of a new era in scientific knowledge, and of discoveries which can not fail greatly to extend the horizon of our vision. ”
