This much is certain: that a mill; whether an old one established by some enterprising pioneer whose name is unknown to us, or a new one built by Philipse, was in operation on the Pocantico from the time that Castle Philipse was erected by the proprietor. The Yonkers and Tarrytown mills were styled by Philipse, respectively, the Lower Mills and the Upper Mills. The residence on the Nepperhan at Yonkers was very substantially built, " the bricks, and indeed all the building materials," says was then esMrs.' Lamb, " being imported from Holland at what teemed aprodigal expenditure. The great massive door, which still swings in the center of the southern front, was manufactured in Holland and imported by the first Lady Philipse in one of her own ships." Only the southern front of the structure was built by the first Frederick. Here he lived for a time with his wife Margaret; at least during the summer seasons. Traces of an underground passdisago, apparently leading from the Manor House, were recently covered by some workmen engaged in making excavations in ofYonkexit ers; and it has been surmised that this was a secret means neigha with probably for 'the occupants of the dwelling, connecting Indian raid. In 1SS2, boring blockhouse, to be used in case of an original buildthe of erection presumed two hundred years after the ing, the Manor House, renamed Manor Hall, after having been put inl state of permanent preservation, Avas formally dedicated to the uses of the City of Yonkers as a municipal building. built,1 Castle Philipse, on the Pocantico, was also very substantially and possessed a feature entirely lacking in the Manor House, being Its walls were pierced with carefully fortified to resist attack. in well known F. Minnerly, William .Mi Tarrytown as a builder, states that in 1864 he the in alterations some make to was Vmplovod One was in House.