515 
Philadelphia, August 9th, aged 70, was announced with 
appropriate remarks by Mr. Patterson. 
On motion, Mr. Dubois was appointed to prepare an 
obituary notice of the deceased. 
The death of Dr. John Bell of Philadelphia, August 19th, 
aged 77, was announced by the Secretary. 
On motion, Dr. B. H. Coates was appointed to prepare an 
obituary notice of the deceased. 
Sommunications were received from Prof. EH. D. Cope 
under the following titles: 
Third account of New Vertebrata from the Bridger Eocene 
of Wyoming Territory. 
Notices of New Vertebrata from the upper waters of 
Bitter Creek, Wyoming Territory. 
Second notice of Extinct Vertebrates from Bitter Creek, 
Wyoming Territory. 
On the existence of Dinosauria in the Transition beds ot 
Wyoming Territory. 
On the Dentition of Metalophodon. 
The Secretary announced that he had received a telegram 
from Prof. Cope, dated Black Buttes, Wyoming Territory, 
August 17th, announcing the discovery of Lefalophodom 
dicornutus, bifureatus, and excressicornis, Cope. 
Prof. Edwin J. Houston called the attention of the Society 
to a remarkable instance of the acoustic sensitiveness of 
matter. “While visiting a number of water-falls on Adam’s 
Brook, Pike Co., Pennsylvania, I noticed one in which a 
scanty supply of water was dripping, in thin delicate streams, 
from the moss covered walls of a precipice. The day was 
unusually calm, and the veins were remarkably free from 
ventral segments for a considerable distance from the fila- 
ments of moss from which they issued. Struck with this 
circumstance the idea occurred to me to test the sensitive- 
ness of the stream to sound pulses. J made the attempt, and 
after several trials found a note, a shrill falsetto, to which 
they would respond. 
The experiment was one of extreme beauty. At one point 
