Its conditions were investigated from photometric data, by Professor E.
Photometric catalogues, accordingly, form an indispensable part of stellar statistics; and their construction has been zealously prosecuted.
Kempf with a polarizing photometer; but by far the most comprehensive work of the kind is the Harvard Photometric Durchmusterung (1901-1903), embracing all stars to 7.5 magnitude, and extended to the southern pole by measurements executed at Arequipa.
The development of the method has been greatly assisted by photography, while the application of photometric measurements has been a powerful auxiliary in the work.
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