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THE papers here collected for convenience of reference form a part of the smaller publications prepared during the last ten years, either as a portion of the work of this Observatory, or as conveying the results of inquiries undertaken by its officers individually. The present collection includes papers separate copies of which were printed for distribution by their authors, and which are of suitable form to be bound together.
An asterisk is prefixed to such titles in the following list as correspond to papers contained in the present collection. The others are excluded, owing to the want of a sufficient supply of copies available for binding. Additional copies of most of the papers here collected, and of a few of the remainder, can for the present be supplied to those interested in the particular subjects to which they relate.
EDWARD C. PICKERING.
CAMBRIDGE, U. S.,
November 28, 1887.