 When the complainant took its mortgages, it knew what the law was.It knew that by the law, if the mortgaged lot should be supplied with Passaic water by the city authorities, the rent of that water, as regulated and exacted by them, would be a first lien on the lot.It chose to take its mortgages subject to this law, and it is idle to contend that a postponement of its lien to that of the water rents, whether after accruing or not, is a deprivation of its property without due process of law.