The grist mill was an interesting structure. Its power was derived from a huge overshot wheel, the water falling on it from a gateway which is still to be seen in the present overflow outlet, and contained a complete set of flouring machinery, two sets of mill stones, hoppers, storage bins, and a bolting-cloth covered flour screen, operated and revolved by wooden cogs. Although it had ceased grinding flour for many years previous to my knowledge of it, I can recall seeing farmers who came a considerable distance with wagon loads of corn to be ground into feed; this, of course, before the Van Cortlandt estate was taken by the city as a public park.