PROCEEDINGS 



OF THE 



POLYTECHNIC ASSOCIATION. 



The Polytechnic Association of the American Institute held its 

 regular meeting on Thursday evening, May 14tli, 1868, Samuel D. 

 Tillman, LL.D,, presiding. 



Fossil Shark Teeth. 



At the opening of the meeting, Dr. J. Y. C. Smith, of Boston, in 

 a few remarks spoke of the fossil shark, remains of which exist in 

 the older geological formations at Gay Head and other points on the 

 Atlantic coast, and exhibited a fossil tooth of the ancient fish, found 

 about fifteen feet below the surface at Richmond, Va. The tooth 

 has a sharp cu|;ting edge, and is about six inches in length, and,, 

 at its broadest part, four inches and three-quarters wide, with a 

 maximum thickness of an inch and a quarter. The surface is, for 

 the most part, of a greenish color, and the fossil weighs in thq neigh- 

 borhood of a pound. 



Dr. Feuchtwano-er stated that the same or similar fossil teeth were 



D 



found in the green sand of New Jersey, indicating that the primitive 

 sharks were of immense size, 



LoNGEVriT. 



Dr. Smith also read a brief but interesting paper on the subject of 

 longevity, citing many instances, from remote and modern history, 

 of persons who had exceeded 100 years of age, the longest life known 

 since primeval times being one- that had extended to 169 years. 



Telnity Chukch Clock. 



Mr. James Rodgers made the following remarks : 

 Mr. Chairman, I desire to say a few words in reference to some 

 observations contained in an essay on the Public Clod's of New 



