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Page:Popular Science Monthly Volume 65.djvu/23

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points and under different conditions. In the near future it is proposed to make a careful systematic study of the motion of the vapor at various regions in the flocculi, in order to determine whether it is generally

PSM V65 D023 Great sunspot of oct 1903 showing the calcium flocculi.png

Oct 9, 3h 43m. Calcium Flocculi, Middle H1 Level. October 9, 3h 30m. Calcium Flocculi H2 Level.
Slit at λ 3966 Slit at λ 3968.6
Fig.9.—The Great Sun-Spot of October 1908.
For comparison with Stereoscope (See Footnote on p. 494).

upward or whether there may be frequent evidence of downward currents or of currents more nearly parallel to the solar surface. Many photographs show the existence of flocculi remarkable for their great brilliancy. In these regions active eruptions are in