the development of the idea of contract, _i.e._ of the capacity of the individual to enter into independent agreements with strangers to his family-group by which he was legally bound--an historical process which Maine sums up in his famous aphorism that the movement of progressive societies has hitherto been a movement from Status to Contract. In the chapters on the early history of Wills, Property, and Contract, Maine supports his theory by showing that it is the key which unlocks many, if not all, of the problems which those topics present. The chapter on Wills--particularly the passage in which he explains what is meant by Universal Succession--is a brilliant example of Maine's analytic power. He shows that a Will--in the sense of a secret and revocable disposition of property only taking effect after the death of the testator--is a conception unknown to early law, and that it makes its first appearance as a means of transmitting the exercise of domestic sovereignty, the transfer of the property being only a subsidiary feature; wills only being permitted, in early times, in cases where there was likely to be a failure of proper heirs. The subsequent popularity of wills, and the indulgence with which the law came to regard them, were due to a desire to correct the rigidity of the Patria Potestas, as reflected in the law of intestate succession, by giving free scope to natural affection. In other words, the conception of relationship as reckoned only through males, and as resting on the continuance of the children within their father's power, gave way, through the instrumentality of the will, to the more modern and more natural conception of relationship.