CHAPTER III. 



Memoirs on the Teeth — Jameson's Kindness — Model Museum — Crania 

 from Fife Barrows — Fossil Fishes — Dredging with Forbes — 

 Natural History and other Papers read to the Societies of St 

 Andrews and Cupar. 



This essay, " On the Origin and Development of the 

 Pulps and Sacs of the Human Teeth," is an excellent 

 and characteristic piece of Goodsir work, and a care- 

 fully-studied inquiry into one of nature's peculiar 

 operations in the human economy. Though hundreds 

 of volumes bore more or less upon the subject, Goodsir 

 was alive to the fact that much remained to be done, 

 and his experience in dentistry was a fitting introduc- 

 tion to the work. The principles of his memoir on the 

 teeth existed hypothetically in Goodsir's mind as early 

 as the year 1834, when he made the preparations for 

 Mr. Nasmyth, and only remained to be fully verified 

 by the investigations he was enabled to pursue after 

 entering medical practice. He examined the human 

 dental arches of different ages, from the embryo in its 

 sixtli week through every month of foetal and infantile 

 life upwards to adolescence, and his observations afford 

 abundanl evidence of great research ami originality! 



He divided dentition into three stages: — 1st, the 

 Follicular; 2d, the Saccular; and 3d, the Eruptive. 

 He also indicated a stage previous to the Follicular, 



