See, e.g., In re Worstall's Estate, 125 Pa. Super. 133, 190 A. 162 (1937); Annots., 104 A.L.R. 282 (1936); and 14 A.L.R.2d 1244 (1950); Thompson, Wills, ยง 273 (3rd ed., 1947). There are certain exceptions to this construction, but they are not applicable to the instant case.