This third edition is a welcome and expanded new edition of this popular textbook. Fully updated, this new edition includes several new chapters on 'Constitutional Jurisprudence'. It forms part of the successful and student focused Clarus Press The Core d104 Series. This book is divided into six parts: the Nature of Jurisprudence; Legal Theory; Socio-Legal Theory; Historico-Legal Theory; Constitutional Jurisprudence; and Applied Jurisprudence. The study of jurisprudence lends reasoning power, not only to such broad questions such as the validity of law and the relationship between law and morals, but also to such particular questions, like the distinction between principles and rules of law and the legal weight given to each. And it is precisely because of this generality of scope and application that jurisprudence may be placed primus inter pares among the core law subjects. (Series: The Core d104 Series) Subject: Constitutional Law, Irish Law]