Orbital elements for the single4ine spectroscopic binaries p Orionis, Bootis, and 32 Virginis have been obtained from Mills observations at a dispersion of 11 A/mm. A combination of astrometric information with the spectroscopic results for Bootis explains the invisibility of the companion. The form of the velocity-curve of the metallic-line star 32 Virginis appears to have changed since the time of the Ottawa and Victoria observations.