260 



of examining a second time the deposit of EupyrchroitCj near 

 Lake Champlain. It occurs in a trap dike, and in such 

 condition as to indicate that it is of the same origin, and 

 therefore igneous. This was an important geological fact 

 in his estimation, as tending to show that Phosphorus is an 

 element in the interior of the globe. In Europe, its con- 

 junction with igneous minerals would point to the same 

 conclusion. The deposit at Lake Champlain was, he said, 

 of great value, as it contained eighty-three per cent, of 

 Phosphate of Lime in mass. 



Prof. Wyman exhibited three fragments of a beak of a 

 fossil fish, (Isthiophorus,) resembling the Sword-fish, from 

 the tertiary deposit at Richmond, Va. Such a specimen 

 had never before been found in the United States. It is 

 an interesting fact, that it occurs in company with fossils 

 similar to those found in the London clay, associated with 

 similar specimens. It is probably an undescribed species. 



Dr. Storer presented several round masses of matted 

 straw and grass, found at the bottom of a pond in Lincoln, 

 Mass. It was a question, what had formed them. Dr. 

 Gould said, he had examined them, and he was inclined to 

 think they had been formed by the motion of the water, 

 beating on the shore, acting on the dry grass, which had 

 become felted together. 



Dr. Jackson presented, in the name of MM. Elie de 

 Beaumont and Dufrenoy, the second volume of their " Ex- 

 plication de la Carte Geologique de France." The thanks 

 of the Society were voted for the donation. 



Dr. J. M. Warren presented a large Stalactite from a 

 Cave in Bermuda. 



Mr. Sprague presented, in the name of the Historical 

 Society, a Collection of more than two thousand dried 

 plants, made up by the late Prof. Peck, and many years 

 since presented to that Society by Thomas H. Perkins, Esq. 



