That part of the work requiring no mortar, such as stone wall for foundation and protection, rock excavation, tunnelling, and earth embankment, will progress during the winter months without abatement.

The first and second divisions, which are included in the contracts made, embrace a line of aqueduct of 21 miles in length, and the Commissioners were only waiting for the possession of the land, then just adjudicated to them, extending to Harlem river, to put under contract so much of the third and fourth divisions, as should carry the aqueduct over that river.

But to enable them to effect their object, more money would be required especially

150 MEMOIR OF THE if, as seemed to be the wish of many citizens, the plan of Major Douglas, of passing the Harlem on a high bridge, maintaining the level of the aqueduct, be adopted. We quote the reasoning of the report on this subject, and as to the conveyance of the water over York Island, together with a new estimate of the cost of the whole work :

With a view of deciding the question, as to the best manner of bringing the Croton water across the Harlem River, the chief engineer was instructed to furnish the Commissioners with an estimate of the cost of crossing said river by an aqueduct bridge, on an inclined plane and also by an inverted syphon, with iron pipes, on a low bridge. ; The following is a synopsis of so much of the report alluded to, as relates to the plan of construction, and some other matters connected with the subject. It appears the width of the river, on the high water level, was found to be 620 feet ;