"These are no school-points; nice philosophy May tolerate unlikely arguments, But heaven admits no jests." Mr. Huxley,[119] who sees advantages (simplicity and unification) in employing a materialistic terminology, adds the very striking caution--"But the man of science, who, forgetting the limits of philosophical inquiry, slides from these" (materialistic) "formulæ and symbols into what is commonly understood by materialism, seems to me to place himself on a level with the mathematician, who should _mistake_ the x's and y's, with which he works his problems, _for real entities_--and with this further disadvantage, as compared with the mathematician, that the blunders of the latter are of no practical consequence, while the errors of systematic materialism may paralyse the energies and destroy the beauty of a life." The words italicized are remarkable. The materializing _façons de parler_ do not embody a knowledge of "real entities" after all. And such is the language of one[120] who stands in the foremost rank of European Biologists. ADDITIONAL NOTES AND ILLUSTRATIONS TO CHAPTER III. A.--ACCOUNT OF SOME THEORIES RESPECTING OUR PERSONAL IDENTITY. In a sentence worthy of the pen of Glanvill or of Sir T. Browne, Locke remarked "The _Ideas_, as well as Children of our Youth, often die before us: And our Minds represent to us those Tombs, to which we are approaching; where, though the Brass and Marble remain, yet the Inscriptions are effaced by Time, and the Imagery moulders away. _The Pictures drawn in our Minds, are laid in fading Colours_, and if not sometimes refreshed, vanish and disappear." _On Retention_, B. II., chap. x. 5. This truly human feeling did not hinder Locke from writing (chap, xxvii.) on the subject of Self-ness in a manner which appeared to imply that Consciousness, or Consciousness _plus_ Memory "_made_" Personal Identity;--or to use Reid's words "whatever hath the consciousness of present and past actions, is the same person to whom they belong."