. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. TEETH. les ; And the editor (M. Duvernoy), in order to obviate any possibility of miscon- ception, has himself subjoined a note to that passage, as follows: "^L'ivoire a etc aussi appelle substance osseuse, a cause de son analogic de composition chimique et de durete avec les os. Mais la nature inerte et inorganique de cette substance, mieux appreciee dans ces derniers temps, surtout par les travaux de M. Cuvier, ne permet plus de la designer, avec justesse, par cette seconde expression. Du moins est-
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. TEETH. les ; And the editor (M. Duvernoy), in order to obviate any possibility of miscon- ception, has himself subjoined a note to that passage, as follows: "^L'ivoire a etc aussi appelle substance osseuse, a cause de son analogic de composition chimique et de durete avec les os. Mais la nature inerte et inorganique de cette substance, mieux appreciee dans ces derniers temps, surtout par les travaux de M. Cuvier, ne permet plus de la designer, avec justesse, par cette seconde expression. Du moins est-il necessaire de premunir le lecteur centre l'ide£ fausse qu'il pourrait en tirer, qu'elle serait organisee, qu'elle se develop- perait a la maniere des ;—Tom. cit. p. 201, (1836). In the same spirit in which M. Du- vernoy sees (in 1848) that a true idea, instead of a false one, may be drawn fromcasual expres- sions and similies loosely applied in the old Le- cons of 1800 and 1805 ; others have sought to depreciate the val ue of the establishment of the truth by citing the doubts, or tentative approxi- mations made by Purkinje and Schwann to my theory, interpreting such approximations by the light of the established truth. So far from finding such a resting-place for doubt in Cuvier's early simile, cited by M. Duvernoy in 1848, or in the interrogatories of Schwann, nothing short of the investigation of the whole of this vast subject, zootomically, develop- mentally, and microscopically, as narrated in my " Odontography," sufficed to settle my own doubts ; and nothing short of the evidence and illustrations given in that work appeared to me adequate to convert anatomists from the excretion-hypothesis to the intussuscep- tion theory. That the dentine is the ossified pulp is an older notion than that it is an inorganic secretion from such pulp. But an hypo- thesis, to be of any value in science, must be proved. Almost every true theory has been indicated, wit
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