•THEAICimCOpE- 



Vol. XI. 



TRENTON, N. J., FEBRUARY, 1891. 



No. 2. 



ORlGiriAL 

 C°A/AVMICATloriS 



THE HISTOLOGICAL DIFFERENCE BETWEEN BONE 

 AND THE ENAMEL . 



F. A. ROGERS, M. D. 



Among the one hundred thousand living species of animals 

 and a like number of plants, not one of this vast multitude 

 has ever been known to produce a structure unlike its kind. 



No seed of corn has ever yielded oats, no turnip a potato ; no 

 pine an apple; the egg of a hen never hatched a turtle or a frog. 

 Throughout Nature like begets like, and this inexorable law 

 holds good in minute cells and their products as well as in com- 

 plex organisms. The physical germ we may see and study, but 

 the spirital hand which guides the germ we cannot discover 

 though we may trace its expressed action upon material things. 



We may watch microscopically the changes produced by the 

 vital power in living matter and, although we have not yet dis- 

 covered the power which directs the cells of tissue in the embryo 

 pursuing their various selective courses, 3^et a study of the pro- 

 gressive changes of contour, arrangement and position manifest 

 in developement must ever be interesting to the student of 

 Nature* 



1 Bead before the Barnstable District Medical Society. 



