TOMES, ON THE DEVELOPMENT OF THE ENAMEL. 213 



On the Development of the Enamel. By John Tomes, 

 F.R.S., Surgeon-Dentist to the Middlesex Hospital. 



{Continued from page 104.) 



Before proceeding with this article, which was commenced in 

 the last Number of the Journal, I must take the opportunity 

 afforded by the publication of the second part to correct 

 certain typographical errors which have crept into the last 

 pages of the first. The first error is somewhat important, as 

 it makes me contradict a previous statement. At page 102, 

 and in the ninth line, not is left out after the word contracted ; 

 and in the tenth line after the word dentine, or has been sub- 

 stituted for hut. At the fifth line from the bottom of the 

 page, alteratives has been substituted for alterations. In page 

 103, at the twentieth line from the bottom of the page, the 

 word sockets has been printed instead of sections; in the 

 eleventh fitted for Jilled ; in the seventh meshes for masses ; 

 and in the fifth line from the bottom of the page, fibrilea for 

 fibrilloi. In page 104, distant will be found instead of dis- 

 tinct in the eighteenth line from the bottom of tlie page. 



The latter part of the preceding paper referred to the 

 structure of the enamel when fully formed. It is proposed in 

 this communication to enter upon the manner of formation. 



Mr. Huxley, in an able article published in this Journal 

 (No. III., 1853), entered very fully into the history of the 

 subject, giving a clear account of the different views which 

 have been promulgated, and citing the authorities for each. 

 Under these circumstances it will not be necessary for me to 

 go over the same ground. I will, therefore, refer the reader 

 to the pages which contain Mr. Huxley's paper, in place of 

 reprinting his historical matter.* 



After adopting this arrangement, that part of Mr. Huxley's 

 paper which gives his own views on the development of the 

 enamel, together with that which has been subsequently 

 written upon the same subject, alone remains for considera- 

 tion. 



Prior to the appearance of Mr. Huxley's essay, it was 

 pretty generally believed that the enamel fibres were formed 

 by the direct calcification of the columns of the enamel 

 organ. This opinion has, however, been shaken by a dis- 

 covery made by that distinguished physiologist. He found 



* On the Development of the Teeth, and on the Nature and Import of 

 Nasmyth's ' Persistent Capsule ;' by Thomas H. Huxley, F.R.S. — ' Quar- 

 terly Journal of Microscopical Science,' No. III., 1853. 



VOL. IV. Q 



