A deed executed in the presence of and attested by two or more witnesses (in the manner in which deeds are ordinarily executed and attested) is so far as respects the execution and attestation thereof, a valid execution of a power of appointment by deed or by any instrument in writing, not testamentary, notwithstanding that it is expressly required that a deed or instrument in writing, made in exercise of the power, is to be executed or attested with some additional or other form of execution or attestation or solemnity.
This section does not operate to defeat any direction in the instrument creating the power that—
This section does not prevent the donee of a power from executing it in accordance with the power by writing, or otherwise than by an instrument executed and attested as a deed; and where a power is so executed this section does not apply.
This section applies to appointments by deed made after the thirteenth day of August, eighteen hundred and fifty-nine.