Page 511 - 89 history of astronomy_opt

ing always 200 to 400 miles distant from its
fellow.
The existence of these canals has been
doubted. Mr. Lowell has now devoted years
to the subject, has drawn them over and
over again, and has photographed them; and
accepts the explanation that they are arti-
ficial, and that vegetation grows on their
banks. Thus is revived the old controversy
511