In a will, thls ls a sentence or secret character lnsert-ed by the testator, of whlch he reserves the knowledge to hlmself, with a condition that no will he may make thereafter should be valld, unless thls clause be lnserted word for word. This ls done as a precaution to guard against later wills belng extorted by violence, or otherwise lmproperly obtained. By the law of England such a clause would be vold, as tending to make the wlll irrevocable, wharton