In Blake v. Doherty (1820) 18 U.S. 359, Chief Justice Marshall said, "to the validity of a grant that there should be a thing granted which must be so described as to be capable of being distinguished from other things of the same kind. But it is not necessary that the grant itself should contain such a description as, without the aid of extrinsic testimony, to ascertain precisely what is conveyed." (Blake v. Doherty, 18 U.S. 359, 362.)