411. Grants and reservations.

On a sale of part of land the buyer may acquire1 as easements2 certain rights over the land which are continuous and apparent, are necessary for the reasonable enjoyment of the land sold, and which had been and are at the time of the sale used by the seller for the benefit of the part sold. Although this will give the buyer such easements and quasi-easements as were previously enjoyed by the land before its division, the existence and extent of these implied rights may not be entirely clear and, for certainty, such matters should be dealt with expressly