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Talk on Astronomical Observations.

The last of the series of practical talks, offered by the Travellers Club, will be given this evening by Professor R. W. Willson, on "Simple Determinations of Latitude and Longitude," in Harvard Hall, at 8 o'clock. The object of this talk is to show the most elementary methods of using astronomical observations in marking out the path that has been followed on a long journey by sea or by land; the methods are such as any intelligent traveller may easily learn and employ. The necessary instruments will be shown and explained. The officers of the Club desire to state that the announcement of this talk in the Calendar two weeks ago was due to a mistake on their part, for which Professor Willson was not responsible.

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