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Yerkes Observatory under construction, looking northeast. The brick work for the first and second floors is complete, and ready for the construction of the domes. The base for the great dome is on the left, the base of the south dome to the right, and George Ellery Hale's dog Sirius is in the foreground. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.