Star-land : being talks with young people about the wonders of the heavens (1891)
Ball, Robert S. (Robert Stawell), Sir, 1840-1913 · London ; Paris : Cassell & Co. · leaf 203
ence between them. They are not in-tended to be the eyes of two distinct people; they are merelytwo conditions of the same eye. They are intended to illus-trate two different states of the eye of a collier. The rightshows his eye when he is above ground in bright daylight;the left is his eye when… … This shows the eye inthe dark. T Fi«. 62.
Astronomy
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