My own attitude toward M. Comte and his partial adherents has been all along that of antagonism. In an essay on the "Genesis of Science," published in 1854, and republished with other essays in 1857, I have endeavoured to show that his theory of the logical dependence and historical development of the sciences is untrue. I have still among my papers the memoranda of a second review (for which I failed to obtain a place), the purpose of which was to show the untenableness of his theory of intellectual progress. The only doctrine of importance in which I agree with him--the relativity of all knowledge--is one common to him and sundry other thinkers of earlier date; and even this I hold in a different sense from that in which he held it. But on all points that are distinctive of his philosophy, I differ from him. I deny his Hierarchy of the Sciences. I regard his division of intellectual progress into the three phases, theological, metaphysical, and positive, as superficial. I reject utterly his Religion of Humanity. And his ideal of society I hold in detestation. Some of his minor views I accept; some of his incidental remarks seem to me to be profound, but from everything which distinguishes Comteism as a system, I dissent entirely. The only influence on my own course of thought which I can trace to M. Comte's writings, is the influence that results from meeting with antagonistic opinions definitely expressed. Such being my position, you will, I think, see that by classing me as a Positivist, and tacitly including me among the English admirers and disciples of Comte, your reviewer unintentionally misrepresents me. I am quite ready to bear the odium attaching to opinions which I do hold; but I object to have added the odium attaching to opinions which I _do not_ hold. If, by publishing this letter in your forthcoming number, you will allow me to set myself right with the American public on this matter, you will greatly oblige me. I am, Sir, your obedient servant, HERBERT SPENCER. We take the liberty of making an extract from a private letter of Mr. Spencer, which contains some further observations in the same connection: