394 Publications <strong>of</strong> the David Dunlap Observatory therein. For some <strong>of</strong> the longer works this has been a rather diffi- cult procedure. For Shapley's Star <strong>Clusters</strong> and his article Stellar <strong>Clusters</strong> in the Handbuch der Astrophysik, which provide such a comprehensive summary <strong>of</strong> information, only material not pre- viously published by the same author has been indexed. In cases where the same author has published more than one paper in a given year, these are differentiated by an italicized Roman numeral following the year. A long series <strong>of</strong> papers forming an obvious whole, such as that <strong>of</strong> Bigourdan, has been indexed under the first year <strong>of</strong> the series with a dash following the date, i.e., 1891 Bigourdan. Certain volumes which appeared in several editions such as Webb, Celestial Objects for Common Telescopes, have been indexed under the date <strong>of</strong> the edition which I used, with a cross reference to the date <strong>of</strong> the first edition. The titles <strong>of</strong> Shaplex s two series, Studies <strong>of</strong> Color and Magnitude in Stellar <strong>Clusters</strong>, in Mt. Wilson Communications, and Studies <strong>of</strong> Magnitudes in Star <strong>Clusters</strong>, in Mt. Wilson Contributions, have been condensed simply to Studies. Readers will find convenient access to the papers <strong>of</strong> three famous astronomers in the collected volumes <strong>of</strong> their work, as follows: The Scientific Papers <strong>of</strong> Sir William Herschel, 2 vols., London, 1912; The Scientific Papers <strong>of</strong> William Parsons, Third Earl <strong>of</strong> Rosce, London, 1926; The Scientific Papers <strong>of</strong> Sir William Huggins, London, 1909. The abbreviations employed have been selected to combine minimum printing space with maximum ease <strong>of</strong> identification for the reader. Certain abbreviations, such as M.\. , A.N., etc., arc so well-known in astronomical literature as to cause no confusion. Abbreviations for other periodicals have been constructed in accord- ance with principles from the I.A.U. Transactions, vol. Ill, pp. 19-39, 1928, in conjunction with the Union List <strong>of</strong> Serials. The latter list has been used extensively in locating the whereabouts on this continent <strong>of</strong> many <strong>of</strong> the rarer volumes. In general the word Observatory has been omitted from the abbreviation, and taken as understood. Where publications are from academies or societies, however, this is always indicated. For most publications the abbreviation has been chosen for ease <strong>of</strong> locating the reference in the Union List; that is, the place <strong>of</strong> publi- cation appears first, followed by the series, such as bulletin, circular, etc. We might note that the publication Comptes Rendus is to be
A <strong>Bibliography</strong> <strong>of</strong> <strong>Globular</strong> <strong>Clusters</strong> 395 found under Academie des Sciences, Paris; and Connaissance des Temps under France, Bureau des Longitudes. The numbers <strong>of</strong> the catalogue <strong>of</strong> Messier and Mechain were assigned in order <strong>of</strong> discovery. Since these numbers are in fre- quent use to-day, the following table is given for convenience in locating these clusters by NGC numbers in this bibliography. Identification <strong>of</strong> Messier-Mechain with NGC Numbers Messier NGC Messier NGC Messier NGC 2
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