150 PROCEEDINGS OE THE PALEONTOLOGICAL SOCIETY 



to the beginning of Pleistocenic time. According to Professor Osborn and 

 others, the Heidelberg race belonged to the second interglacial epoch, while 

 in the third began the great cultural stages of Paleolithic man. There seems" 

 to be no justification for excluding the period of the "Men of the Old Stone 

 Age" from the Psychozoic era, and the author proposes that in the future the 

 following classification be adopted : 



Psychozoic Era. (Quaternary Time.) Age of Man. 

 sens. lat. 



Holocenic or Holocene Period. 



Pleistocenic or Pleistocene Period. 

 Cenozoic Era. (Tertiary Time.) Age of Mammals. 



Pliocenic or Pliocene Period. 



Miocenic or Miocene Period. 



Oligocenic or Oligocene Period. 



Eocenic or Eocene Period. 



Paleocenic or Paleocene Period. 

 Mesozoic Era. (Secondary Time.) 



Usual subdivisions. 



Discrssiox 



The paper was discussed by Doctors Osborn, Schuchert, Berry. Stanton, and 

 others. There seemed to be a general disinclination to accept the term Psycho- 

 zoic. Professors Schuchert and Osborn pointed out that a greater faunal 

 break existed between the Pleistocene and the Holocene than between the 

 former and the Pliocenic. Professor Osborn and Doctor Stanton, however, 

 include both Pliocenic and Holocene under the Quaternary, and Professor 

 Osborn argued for this twofold subdivision imder the Cenozoic — that is, the 

 Tertiary — as the Age of Mammals and the Quaternary as the Age of Man, 

 while Professor Schuchert and others would prefer to discontinue the use of 

 the terms Tertiary and Quaternary. Professor Grabau in reply restated his 

 position that if it is recognized that Tertiary and Quaternary represented the 

 two final divisions of the time scale, and if the latter, the Age of Man. is made 

 to include both the Pleistocene and Recent (Holocenic), and, further, if it 

 appears desirable to substitute terms equivalent to Mesozoic and Paleozoic 

 for these numerical designations, then Cenozoic for the Tertiary and Psycho- 

 zoic for the Quaternary would be the logical substitution. 



Dr. John M. Clarke then delivered an address which had been pre- 

 pared for the meeting at the request of the Council. The members fol- 

 lowed his very interesting and timely remarks "udth close attention^ and 

 at the close of the paper Dr. J. C. Merriam expressed the appreciation of 



the Society. 



PHILOSOPHICAL ASPECTS OF PALEOXTOLOGT 

 BY JOHX M. CLARKE 



Professor Osborn followed Doctor Clarke with two papers, in which he 

 gave an account of the progress of work at the American Museum of 



