Présentation de l'éditeur
The papers contained in this volume are of a purely descriptiiie character. The experiments described therein are to be considered as merelf preliminary, and do not pretend to show more than the feasibility of the methods explained. What the accuracy obtainable by them will be has to be decided by systematic observations. One series of such observations, referring to the first paper, was finished some time ago and is nearly ready for publication ;two others, referring to the fourth and fifth, are now in progress. Experiments suggested in the last paper are not contemplated here for the present. Georgetown College Obseevatoet, 1894. J. G. HAGEN, S. J.
(Typographical errors above are due to OCR software and don't occur in the book.)
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