378 



been the earliest animals created, but in fact they were not. The 

 earliest were Ganoids and Selachians. 



Prof. Agassiz made some remarks upon the differences 

 exhibited between the coral stocks of Rugosa and those 

 of ordinary corals. 



Prof. H. D. Rogers exhibited his new Geological Map 

 of the State of Pennsylvania, upon which he has been 

 engaged for many years past. 



The Pennsylvania portion of the Appalachian chain, he re- 

 marked, represents its characteristic structure better than it 

 is elsewhere to be seen in the United States. The map has 

 been constructed from the results of numerous surveys, — from the 

 maps, profiles, and other drawings of the State engineers of canals, 

 — reduced to a common scale, and corrected with the progress of 

 geological research, and, in intricate districts, by trigonometric 

 surveys. The Northeastern portion of the State especially, has 

 been subjected to rigid topographical survey. Prof. R. also ex- 

 plained the processes by which a number of colors are put upon 

 the map by a few impressions. Prof. R. also alluded to the exist- 

 ence of the remains of several species of the camel and horse, 

 which has lately been demonstrated in the wide tertiary area of 

 Nebraska and the neighboring regions. 



Mr. C. J. Sprague exhibited an orange, partially cov- 

 ered with a black mould which has been very common 

 this season on this fruit, covering the end where the stem 

 was attached. 



He had examined many to ascertain its character, but had not 

 been able to identify it. Recently, however, he had found sev- 

 eral of the fruit on which the mould had developed freely, and 

 ascertained that the black stain was the Antennaria form of a 

 Capnodium, probably the O. elongatum. This fungus appears 

 first in a series of aggregated cells, which, applied end to end, 

 creep over the object on which it grows, forming a thin, black 

 crust. This is the state in which it has aj^peared on the oranges 

 in abundance. But under favorable circumstances it finally 



