What to read after Natural Law and the Theory of Society, 1500 to 1800?

Gierke, Otto. Natural Law and the Theory of Society 1500 to 1800. With a Lecture on the Ideas of Natural Law and Humanity by Ernst Troeltsch. Translated with an Introduction by Ernest Barker. Complete in one volume. Cambridge: The University Press, 1950. Reprinted 2001 by The Lawbook Exchange, Ltd. LCCN 2001016483. ISBN 1-58477-149-6. Cloth. $110. * Reprint complete in one volume that contains "an English translation of five sections of the fourth volume of Otto von Gierke's magisterial treatise on the history of the German law of associations. When this edition was published, all competent students of the history of jurisprudence and political thought at once recognized that Professor Barker had made a very important contribution to the literature of these fields, none the less so because of the elaborate and learned Introduction which he himself had contributed." C.J. Friedrich, Harv. L. Rev. 49:677-680 cited in Marke, Catalogue of the Law Collection at New York University 938. Gierke [1841-1921], an important German jurist, is widely considered to be a founder of modern German constitutional law.