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that V. M. Slipher, at Flagstaff Observa-
tory, succeeded in 1907 in rendering some
plates sensitive far into the red. A repro-
duction is given of photographed spectra of
the four outermost planets, showing (1) a
great number of new lines and bands; (2)
intensification of hydrogen F. and C. lines;
(3) a steady increase of effects (1) and (2) as
we pass from Jupiter and Saturn to Uranus,
541