Curiosities of the sky, a popular presentation of the great riddles and mysteries of astronomy (1909)
Serviss, Garrett Putman, 1851-1929 · New York, London, Harper & brothers · leaf 267
y many, be-cause they were too straight and too suggestivelygeometrical in their arrangement to permit the con-clusion that they were natural watercourses. Amost surprising circumstance noted by Schiaparelliwas that the canals made their appearance afterthe melting of the polar snow in the… … THE GREAT MARS PROBLEM liquidation proceeded. Another very puzzling ob-servation was that many of them became double asthe season advanced; close beside an already exist-ing canal, and in perfect parallelism with it, an-other would gradually make its appearance. Thatthese phenomena actually existed…
Astronomy
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