1861; _A System of Synthetic Philosophy_ (12 vols., 1862-96), made up as
follows: _First Principles_, 1862; _Principles of Biology_, 2 vols.,
1864-7; _Principles of Psychology_, 2 vols., 1870-2; _Principles of
Sociology_, 3 vols., 1876-96; _Ceremonial Institutions_, 1879;
_Principles of Morality_, 2 vols., 1879-93 (vol. i, part I published as
_Data of Ethics_, 1879; part 4 as _Justice_, 1891); _Political
Institutions_, 1882. Meanwhile the following works were also published:
_The Classification of the Sciences_, 1864; _The Study of Sociology_,
1872; _Descriptive Sociology_, 1873; _The Man versus the State_, 1884;
_The Factors of Organic Evolution_, 1887; _The Inadequacy of Natural
Selection_, 1893. Spencer's _Autobiography_ appeared posthumously, 2
vols., 1904.

COLLECTED EDITION. Nineteen volumes, 1861-1902.

BIOGRAPHY AND CRITICISM. T. Funk-Brentano, _Les Sophistes grecs et les
Sophistes contemporains_ (Mill and Spencer), 1879; F.H. Collins, _An
Epitome of the Synthetic Philosophy_, 1889; H. Sidgwick, _Lectures on
the Ethics of Green, Spencer and Martineau_, 1902; 'The Philosophy of
Herbert Spencer' (in _The Philosophy of Kant and Other Lectures_, 1905);
D. Duncan, _An Introduction to the Philosophy of Spencer_, 1904; _Life
and Letters of Herbert Spencer_, 1908; J. Royce, _Herbert Spencer. An
Estimate and a Review_, 1904; J.A. Thomson, _Herbert Spencer_, 1906;
W.H. Hudson, _Herbert Spencer_, 1916; J. Rumney, _Herbert Spencer's
Sociology_, 1934; R.C.K. Ensor, _Some Reflections on Herbert Spencer's
Doctrine_, 1946.