330 
cord with the Rochester resolutions. The remaining resolutions, 
while not acted upon, were received with favor both in public 
and in private. It will only be necessary to make a forcible pre- 
sentation of (1) what constitutes the publication of a species, and 
(2) the importance of our principle of homonyms, to carry con- 
viction to the Continental botanists. Later conversations at Kew 
convince us that the English botanists will accede to any rea- 
sonable standard that promises uniformity and fixity. 
LUCIEN MARCUS UNDERWOOD. 
DePauw UNIVERSITY, October roth, 1892. 
Palaeobotany of the Yellow Gravel at Bridgeton, N. J. 
By ArtHuUR HOLLIcK. 
(Abstract from manuscript in preparation for a bulletin of the United States Geo- 
logical Survey. Read at the meeting of the Club on October 11, 1892.) 
A year ago, in the course of an address in memory of the 
late Dr. John I. Northrop, before the New York Academy of 
Sciences, I expressed the hope that much of the work which he 
left unfinished would be completed by others, and not be lost to 
science. To me subsequently fell the responsibility of preparing 
a portion of his work for publication, and the results of such 
preparation form the basis of this paper. 
Some ten years ago attention was first called to impressions 
of fossil leaves, in a more or less incoherent sandstone, occurring 
in the neighborhood of Bridgeton, N. J. No systematic study — 
of the material was attempted, however, until many years after- 
wards, when Dr. Northrop took hold of it, and not only studied 
the specimens thus far collected but added largely to them by 
personal collection. | 
Much of the material first obtained was too poor for proper 
identification, but the later collections contain specimens well pre- 
served, and afford good subjects for study. 
The geological aspect of the matter I shall not discuss in this 
paper—that will be treated elsewhere. In what follows I pro 
pose to discuss the botanical facts involved, especially in reter- 
ence to the efforts which have been made to compare and identify 
the fossil forms with genera and species now living. 
