A general description of the property conveyed may be qualified by what is known as ' 'exceptions and reservations."

An exception is a withdrawal from the operation of the grant of some part of what is granted in general terms, as for instance, a grant of a certain field, except the northwest acre.1 An exception is therefore always a part of the thing granted and is tangible.

A reservation is the creating out of the property-granted, of some new incorporeal hereditament, such as a right of way for the benefit of the grantor.