Excerpt from Measures of Proper Motion Stars Made With the 40-Inch Refractor of the Yerkes Observatory in the Years 1907 to 1912 The other list, forming Part I, includes all other stars for which prior observations with the micrometer have been made. Unfortunately the early work in this field is confined to a few observers, the principal ones being Otto Struve, Engelhardt, and Ball. For some of the other stars recent photographic positions...