There is the independent question whether the subject matter of the dredging lease is "land" within the meaning of s. 88 (2) of the Income Tax Assessment Act, but for present purposes that question may be put to one side. There is no reason for thinking that, at common law, a lease cannot be granted of portion of the sea-bed, provided that the property the subject of the grant is defined with sufficient certainty. There may be some question whether the sea-bed answers the description of "land" in every sense in which that word is used. But in general the word in its legal signification includes any ground, soil or earth (Halsbury's Laws of England, 3rd ed., vol. 32, p. 249). There is a long history of leases for mining purposes of strata of land underlying the sea, which supports the view that a lease may be granted of portion of the sea-bed. The description contained in the schedule to the dredging lease makes it clear that the property the subject of the instrument consists of the surface of the sea-bed as it exists at the time of the grant to a specified depth forty-five feet below Admiralty datum. The exception specified in the schedule then excludes so much of the sea-bed as is excavated in accordance with the dredging carried out by the appellant. By reason of this exception the vertical ceiling of the property demised is reduced and assumes the actual surface of the sea-bed as it exists from time to time so long as it does not extend beyond the surface as it existed at the time of grant. Consequently, the property the subject of the dredging lease does not include the superjacent waters, but is confined to the surface of the sea-bed, extending to the depth specified in the schedule. It follows, therefore, that in my opinion the property which was the subject of the instrument is land within the general acceptation of that expression, notwithstanding that it has the character of sea-bed.