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9. FURTHER CLASSIFICATION OF CATEGORIES LIKE THE HE I 3888 ``WIND-LINE'' STARS

After the identification and collecting together of an appreciable number of members of this group, we are faced with a different kind of problem in deriving a complete spectral classification for them. Their approximate spectral types range from Wolf-Rayet and O at the earlier type to around middle B at the later. The optimum procedure cannot be predicted for such situations in advance; and it does not seem even certain that the spectral-type/luminosity-class parameters used for normal spectra will be the most natural for members of such a group.