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astronomical physics. The utmost that can
be attempted is to give a fair idea of the
directions of human thought and endeav-
our. During the last half-century Amer-
ica has made splendid progress, and an en-
tirely new process of studying the photo-
sphere has been independently perfected by
Professor Hale at Chicago, and Deslandres
at Paris.[8] They have succeeded in pho-
467
