Pius (Bologna, 1520), and the principal editions since have been those by Barth (1623), P. Burman (1731, in his edition of the minor Latin poets), Wernsdorf (1778, part of a similar collection), Zumpt (1840), and the critical edition by Lucian Muller (Teubner, Leipzig, 1870), and another by Vessereau (1904); also an annotated edition by Keene, with a translation by G.
Keene Valley, in the centre of Essex county, is another picturesque region, presenting a pleasing combination of peaceful valley and rugged hills.
In his theses as well as in his early writings - such as De la subrogation Keene, La Bonorum possessio, and Sur la duree des effets de la minorite (1870) - he endeavoured to explain the problems of laws by means of history, an idea which was new to France at that time.
The principles which govern the preparation and setting of the other class of calcium sulphate cements, that is, cements of the Keene class, are not fully understood, but there is a fair amount of knowledge on the subject, both empirical and scientific. The essential difference between the setting of Keene's cement and that of plaster of Paris is that the former takes place much more slowly, occupying hours instead of minutes, and the considerable heating and expansion which characterize the setting of plaster of Paris are much less marked.