The most general opinion seems to be
that they are illuminations of the lines of force which undoubtedly
circulate round our earth. At all events, the corona forms itself round
the magnetic poles, and its lines correspond to the earth's magnetic
field. Displays of aurorae are almost always accompanied by magnetic
storms, which so much affect our telegraph instruments, although the
latter may occur when there is no visible aurora. An artificial aurora
was produced by electrical means by Professor Lindstroem, in 67 deg. north
latitude, which was found to exhibit the spectrum of the true aurora.
You will find all information respecting the "Zodiacal light" in
"Guillemin on the Heavens."
C. H. C.--No examinations are required for teachers in high schools; but
of course preference is always given to those who have passed
examinations, and they obtain better salaries. The senior or the higher
Cambridge examinations for women would be the best, and would ensure a
good position.
MISCELLANEOUS.
MARIE.--Your having given your parrot meat has given her a taste for raw
meat. Perhaps a chemist could suggest a wash or powder to shake in under
the feathers, that would taste bitter and disagreeable and yet prove
harmless.
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