Erskine May: A treatise on the law, privileges, proceedings and usage of Parliament.

A first edition of Thomas Erskine May's ‘A treatise on the law, privileges, proceedings and usage of Parliament' . Though not the first guide to Parliamentary practice it received widespread acclaim and acceptance within parliamentary and public spheres. The treatise has become the authorative guide to parliamentary procedure and has helped shape Westminster politics and been influetial throughout the Commonwealth. 

May's less prominent published works were The Constitutional History of England since the Accession of George III (1861-1863) and Democracy in Europe (1877).