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Sometimes these clouds are grouped and arranged almost like the rays of an aurora borealis; they then appear to disturb the magnetized needle. Father Secchi has remarked, that magnetic disturbances are manifested at Rome whilst the sky is veiled with clouds that are slightly phosphorescent, which, at night, present the appearance of feeble aurorae boreales.
MM. Cornulier and Verdier are convinced, after carefully studying the subject, that there are almost always aurorae boreales in the high polar latitudes, and that their brilliancy alone is variable. This conviction is in accordance with the very careful observations which have now been made for four years in the northern hemisphere.
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