SECTION 1. Section six hundred and fourteen of Act Numbered One hundred mid ninety is hereby amended so that the said section shall read as follows:
"SEC. 614. Every person eighteen years of age or over and of sound mind may devise, bequeath, and dispose of his estate, real and personal, and of any right or interest which he has in his real or personal estate, by his last will and testament: and the words "every person" shall include married women: Provided, That no Lesal person can by will deprive a husband, or wife, or heir of such interest in his estate as the law provides shall appertain to such husband, wife, or heir, notwithstanding the execution of a will."