nt itself. This, on some rare occasions, is
a feature of the phenomenon of parhelia.

It thus appears that the occasional iridescence of cirrus clouds is
satisfactorily accounted for by the concurrence of conditions, each of
which is known to have a real existence in nature....--_Phil. Mag.,
July 1887._

* * * * *

THE SCIENTIFIC AMERICAN

ARCHITECTS AND BUILDERS EDITION.

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