Spectral types 6n the Yerkes system have been determined for 102 stars included in the c-star catalogue published by Miss Payne in 1930. The stars studied are those of types A3-K5, with the exception of certain variable stars. Though 36 of the stars have been classified as belonging to luminosity classes Ia and Ib, 30 others appear to be less luminous than normal giants; among the latter are 9 metallic-line stars. The great majority of the stars situated at high galactic latitudes are of low luminosity. Brief descriptions and references are given for a number of astrophysically important peculiar stars in the catalogue.