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ision for avoiding the danger.
Professor Arago classed several well-known sites according to the frequency of their storms, from the best information he could obtain.
His list begins as follows: —
Days of Thunder
2. Patna (India) supposed to average53
3. Rio Janeiro averages50.6
4. Maryland (U. S.) supposed to average41
Abyssinia supposed to average38
8. Viviers (France) averages24.7
9. Quebec averages23.3
Buenos Ayres averages22.5
Denainvilliers (France) averages20.6
The lowest average he gives is that of Cairo in Egypt, three days of thunder per annum.
That of Paris and most of the European cities is about fifteen days. He estimates the days of thunder at New York to be about the same.
Lightning rods, points, and Attachements.
Fig. 2954 exhibits some of the numerous variety of rods for which patents have been secured in the United States.
a has a serie