most philosophic statement of the duties of the state. As in his earliest book, he limits state-functions to the maintenance of justice at home, and the repelling of aggression abroad. His formula of justice is stated by him in the words: 'Every man is free to do that which he wills, provided he infringes not the equal freedom of any other man.' Two further divisions indicate the duties of men towards one another, which are not, however, to be enforced by law.
The following is a list of the volumes published by Spencer: 1. 'Social Statics,' 1850; abridged and revised edition (together with 'The Man versus The State'), 1892. 2. 'The Principles of Psychology,' 1 vol. 1855; 2nd edit. vol. i. 1870, vol. ii. 1872; 4th edit. 1899. 3. 'Essays,' 1st series, 1857; 2nd series, 1863; 3rd series, 1874; American reprints of the first two series; final edit, (in three volumes) 1891. 4. 'Education,' 1861; cheap reprint, 1878. 5. 'First Principles,' 1862; 6th edit. 1900; 3rd impression, 1910. 'The Principles of Biology,' vol. i. 1864, vol. ii. 1867; revised and enlarged edit. vol. i. 1898, vol. iL 1899. 7. 'The Study of Sociology ('International Scientific Series'), 1873; library edit. 1880. 8. 'The Principles of Sociology,' vol. i. 1876; 3rd edit. 1885; part iv. 'Ceremonial Institutions,' 1879; part v. 'Political Institutions,' 1882; parts iv. and v. were subsequently bound together to form vol. ii. of 'The Principles of Sociology,' 1882; part vi. 'Ecclesiastical Institutions,' 1885; part vi. was subsequently bound up with two further divisions and issued as vol iii. of 'The Principles of Sociology' in 1896. 9. 'The Principles of Ethics': part i. 'The Data of Ethics,' 1879; new edit. 1906; part i. was afterwards bound up with two more divisions to form vol. i. of 'The Principles of Ethics,' 1892; part iv. 'Justice,' 1891; part iv. was similarly bound up subsequently with two more divisions and issued as vol. ii. of 'The Principles of Ethics' in 1893. 10. 'The Man versus The State,' 1884; 2nd edit, (bound together with 'Social Statics') 1892. 11. 'The Nature and Reality of Religion,' 1885. This work, published in America, embodied a controversy on the Positivist religion that had taken place between Spencer and Mr. Frederic Harrison. Owing to copyright difficulties raised by Mr. Harrison, Spencer suppressed the book soon after its publication. It was however reissued the same year without his knowledge under the title 'The Insuppressible Book.' 12. 'Various Fragments,' 1897; enlarged edit. 1900. One of these 'fragments,' entitled 'Against the Metric System' (1896), was reissued separately in 1904 with additions, under a provision in Spencer's will. 13. 'Facts and Comments,' 1902. 14. 'Autobiography,' 1904. Portions of various of these works are on sale separately. 'Education,' 'Man versus the State,' 'Social Statics,' and 'Selected Essays' have been issued in sixpenny editions by the RationaUst Press Association, while the trustees contemplate the issue of a complete popular edition of Spencer's 'Philosophy,' and have already published shilling editions of 'First Principles,' 2 vols., 'Education,' and 'The Data of Ethics.' In addition to the above list of works, Spencer issued during his lifetime eight instalments of the 'Descriptive Sociology,' viz.: No. 1, 'English,' 1873; No. 2, 'Ancient Mexicans, Central Americans, Chibchas, and Ancient Peruvians,' 1874; No. 3, 'Types of Lowest Races, Negritto Races, and Malayo-Polynesian Races,' 1874; No. 4, 'African Races,' 1875; No. 5, 'Asiatic Races,' 1876; No. 6, 'American Races,' 1878; No. 7, 'Hebrews and Phoenicians,' 1880; No. 8, 'French,' 1881. Since Spencer's death further instalments have been issued, and No. 9, 'Chinese,' and No. 10, 'Greeks: Hellenic Era,' appeared in 1910. The series is now in regular progress, the intention being to bring the number to some 24 parts. Spencer reissued his father's 'Inventional Geometry' with a preface in 1892; and he also published his father's 'System of Lucid Shorthand' in 1893.
