“…Observations of Comets Arend-Roland 1957 III, Mrkos 1957 V (Bappu and Sinvhal, 1960) Ikeya-Seki 1965 VIII (Bappu et al, 1967), Tago-Sato-Kosaka 1969 IX (Wolf, 1972), Bennett 1970 II (Bugaenko et al, 1973;Kharitonov and Rebristyi, 1973), Kohoutek 1973 XII (Bugaenko et al, 1974;Noguchi et al, 1974), West 1976 VI (Kiselev andChernova, 1978), showed that, in the visual domain, the polarization increases with increasing wavelength. The polarization in IR has the same order of magnitude as in the visible light (Noguchi et al, 1974;Oishi et al, 1978a).…”