309 



Jackson was not of opinion that all lime rocks are the 

 secretions of animals, for these must have derived their 

 lime from some external source. He thought that lime 

 rocks were probably part of the original elementary struc- 

 ture of the earth. 



A donation of two large specimens of native copper from 

 Lake Superior was received, in the name of Mr. Frederick 

 W. Davis. The thanks of the Society were voted for 

 the donation. 



Mr. B. F. Kendall was elected a member of the Society. 



March 3, 1853. 



The President in the Chair. 



A note was read from Mr. William Stimpson, presenting 

 to the Society a large number of specimens of Mollusca pre- 

 served in spirit. 



The President exhibited to the Society a skeleton of 

 Ornithorhyncus, probably the only one in the United States. 

 He pointed out in detail its various curious anatomical 

 features. 



The Secretary read a paper from Dr. W. I. Burnett on 

 the reproduction of lost parts in Reptiles, as illustrated in 

 the case of the Glass Snake, as follows : 



Last year I presented to the Society a communication on the 

 Ophisaurus veniralis and Scincus fasciatus, noticing their well 

 known and remarkable power of voluntarily snapping off their 

 tails to elude pursuers, and describing the disposition of the 



