Wolf-Rayet stars are rare and their basic properties such as mass, effective temperature, and luminosity are similar to those of 09 to B1 stars. the spectra of Wolf-Rayet stars from about 10 μm to 1000 Å consist of rather broad emission lines on a continuous spectrum. the continuous spectrum corresponds to effective temperatures in the range from 25000 to 30000 K (Underhill 1983b). A few shortward displaced absorption troughs appear and a few emission lines are flat topped. There is a strong infrared excess attributed to thermal bremsstrahlung (Cohen, Barlow, and Kuhi 1975), and there is rather strong 6 cm radiation (a fraction of a mJy from stars at distances of the order of 1500 pc), see for instance, Bieging, Abbott, and Churchwell (1982). the radio radiation can be attributed to thermal bremsstrahlung and to magnetic bremsstrahlung (cyclotron radiation), see Underhill (1983a). X rays have been measured from a few Wolf-Rayet stars (Sanders, et al. 1985).