Books in general, law books in particular, are like people. Most of them are ordinary, some useful, some not, but if they had not appeared they would not have been greatly missed, having appeared they will live their few years and at least seem to be forgotten. A few are so outstanding that they make a strong impress on their time and live on beyond the period of a life. If not great they have great influence and make notable contributions. Among the notable books of our time in the field of property law may be mentioned Jarman on Wills and Gray’s Rule Against Perpetuities. If Kales’s Future Interests in Illinois is a lesser light it is entitled to appear in their company and must be regarded as one of the few notable law books of the time. This is not prophecy merely; Kales’s first book in this field, and his numerous contributions to law journals, have already settled that. Among living writers on future interests in property none has a more assured position.