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For instance, the period of the lunar semi-diurnal tide will of course be half the average time occupied by the moon to travel round from the meridian of any place until it regains the same meridian; the period of the lunar diurnal tide will be double as great; and there are fortnightly tides, and others of periods still greater.
The records kept by accurate observers at various points on the Lakes for the last ten years do not seem to confirm this theory; but it has been well established by the recent observations of Colonel Graham, at both ends of Lake Michigan, that there is a semi-diurnal lunar tide on that lake of at least one third of a foot. The evaporation from this great water-surface must be immense.
His diminution spoke volumes for the unexpected force of personality Florence must have shown in that unrelated interview about the letters, in which she had got back her promise. The burden of action during those ensuing days fell on Larcher. Besides regular semi-diurnal calls on the young ladies and at Mrs.
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