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Parrish was an observer at Leander McCormick Observatory of the University of Virginia, Charlottesville. In his time Ormond Stone was director (1882-1912). Stone's first assistant was Francis Leavenworth and Parrish became his successor in 1887. A fourth observer, contributing to the discovery of new nebulae, was Frank Muller. The observations were made from 1887-90 with the 26¼" Clark refractor (erected in 1874) using a magnification of 175; see: Southern Nebulae, Publ. Leander McCormick Obs. 1, 173 (1913).
Parrish discovered 4 IC objects (all in Centaurus). IC 90, found on January 1, 1889, is a galaxy. IC 953, found on April 24, 1889, is only a star. The remaining objects, IC 955 and 957, found on March 3, 1889, are lost ("not found"). Generelly the published positions are not very precise.
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