Bequests upon trust to use the income thereof each year in keeping a monument or grave in repair, or in saying masses,8 or in having a brass band to play at the testator's grave each year on the anniversary of the testator's death9 have been held invalid, and the reason given is that the gift is a "perpetuity"1 or is in "violation of the rule against perpetuities."11 What do the courts mean by calling such a gift a "perpetuity?" And in what way, if at all, could the bequest be so changed as to avoid the "rule against perpetuities" and thus make the gift valid?
Clark, George L. "Unenforceable Trusts and the Rule against Perpetuities." Mich. L. Rev. 10 (1911): 31-41.