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After some general observations on the various discoveries lately made, which have contributed to extend our knowledge of the construction of the heavens, Dr. Herschel assumes as a possibility, that among the multitude of the stars in the firmament, there may be instances of pairs of stars of the same or different relative magnitudes, which may revolve, either in circles or ellipses, round their common centre of gravity. Having started this hypothesis, he proceeds to give an account of a series of observations on double stars, comprehending a period of twenty-five years, which, in his opinion, will go to prove, according to the above assumption, that many of them are not merely double in appearance, but must be allowed to be real binary combinations of two stars, intimately held together by the bond of mutual attraction.

abstracts of the papers printed in the philosophical transactions of the royal society of london

Account of the changes that have happened, during the last twenty-five years, in the relative situation of double-stars; with an investigation of the cause to which they are owing