Investigations representing the departments. Astronomy and astrophysics ..
Measures of double stars with the forty-inch refractor of the Yerkes observatory in 1900 and 1901, by S.W. Burnham.--Micrometrical observations of Eros made with the forty-inch refractor of the Yerkes observatory during the opposition of 1900-1901, by E.E. Barnard.--On certain rigorous methods of treating problems in celestial mechanics, by F.R. Moulton.--Radial velocities of twenty stars having spectra of the Orion type, by E.B. Frost.--The spectra of stars of Secchi's fourth type, by G.E. Hale.--Astronomical photography with the forty-inch refractor and the two-foot reflector of the Yerkes observatory, by G.W. Ritchey.--The orbit of the minor planet (334), by K. Laves
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