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    THE BINARY STAR η CASSIOPEÆ—Dr. Doberck, of Col. Cooper's Observatory, Markree Castle, has communicated to the Royal Irish Academy the results of a complete discussion of the elements of this binary from the measures to 1875. Though he does not consider the exactness of the orbit to be great, partly owing to the observations being rather unfavourably placed, and partly to uncertainty in the observed distances, the agreement with observation is pretty close, and it appears likely that preference may be given to his elements, over those lately given by Dr. Duner, if the latter are correctly printed, Dr. Doberck's orbit is as follows, being the result of a sixth approximation:—

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