240 PROCEEDINGS OF THE ACADEMY OP 



was an evident flow of wood from the interior over and down this 

 layer of inclosed bark. 



He remarked that this section of wood was taken from a stem 

 which had been led to support itself in an upright position.. When 

 the Wistaria is permitted to trail along the ground numerous 

 rootlets are formed along its length. He thought from the appear- 

 ance of the wood, in the specimen presented, that rootlets had 

 partiall} r formed in these erect stems, pushing through the liber, 

 and then instead of penetrating entirely through the bark, and 

 forming perfect rootlets, they remained within the cellular matter, 

 and descending joined with the regular woody layer in forming 

 an annular course of wood. This explanation was the more 

 plausible, he thought, from the fact that woody stems formed on 

 the ground. Where the rootlets went quite through into the earth, 

 the stems were nearly regularly cylindrical ; but these upright 

 stems on which rootlets were never seen had an irregular fluted 

 appearance; of course, this explanation does not accord with the 

 formation of wood in ligneous structures as generally understood ; 

 but he could not understand how the appearance presented could 

 have occurred in any other way, than as he had supposed. 



Attention was called to a twin apple, on the table, with two stems 

 and stem cavities, and two cabyx basins a little below which, how- 

 ever, an union had taken place. Mr. Meehan said these phenomena 

 were rather common with various fruits and the mode of produc- 

 tion well understood. It was simply the inarching of two fruits 

 at a very early stage of their existence, through two embryonic 

 blossoms having perhaps been produced in juxtaposition from one 

 bud. 



Dr. Joseph Carson said that he thought the variety exhibited, 

 the winesap, had a tendency to pair young buds and thus bring 

 forth these united twin fruit. He had once known a tree of them 

 which produced a large proportion of the fruit of this character. 

 He had seen perhaps a peck of them which had been gathered at 

 one time from the tree. 



October 15. 



The President, Dr. Rusciienberger, in the chair. 



Twent} r -one members present. 



Bemarks on Fossil Mammals from Wyoming. Prof. Leidy di- 

 rected attention to the collection of fossils, from the vicinity of 

 Fort Bridger, Wyoming, presented this evening by Dr. J. Tan 

 A. Carter, Dr. Joseph K. Corson, U. S. A., and himself. Among 

 them are the more characteristic remains noticed in a letter sent 

 by him to the Academy last July, published August 1st, and sub- 

 sequently in the Proceedings, page 1G7. Some of the fossils were 



