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It is shown that a planet having the mass and orbital elements derived by Brady from the residuals in the times of perihelion passage of Halley's comet will affect the motions of the five planets Jupiter-Pluto to a degree that is completely incompatible with the observations. Furthermore, careful reexamination of plates obtained during the Lowell Proper-Motion Survey does not reveal a planetary object anywhere near the position predicted by Brady and brighter than magnitude 16™5. It isdoi:10.1086/129397 fatcat:ylest4krvfhuzktskzvhmy2kli