Philosophers' Critiques
- Herbert Spencer: An Estimate and Review (1904) by Josiah Royce.
- Lectures on the Ethics of T.H. Green, Mr. Herbert Spencer, and J. Martineau (1902) by Henry Sidgwick.
- Spencer-smashing at Washington (1894) by Lester F. Ward.
- A Perplexed Philosopher (1892) by Henry George.
- A Few Words with Mr Herbert Spencer (1884) by Paul Lafargue.
- Remarks on Spencer's Definition of Mind as Correspondence (1878) by William James.
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