Research on Extinct Vertebrates 97 



time and in its evolutionary characters between the Three-Toed 

 Horses of the Miocene and the large One-Toed Horses of the 

 Pleistocene and present time. 



The exhibit of the extinct animals of South and Central 



America has been re-cased, the large Groundsloth and Glyptodont 



group being now installed in a suitable case at the 



Rearrange- center of the south side of the hall, and the Toxo- 



ment ot boutn ^ Macrauchenia and Hippidium skeletons in a 

 American 



Fossil wa ^ case next t0 tnem - The l ar g e group is ilium- 



Mammals inated by electric lights concealed within the 

 margin of the top of the case and now affords an 

 excellent example of the advantages of this type of illumination, 

 for which it was originally designed when planned ten years 

 ago. It is probable that methods of artificial lighting can be 

 applied to many of the fossil exhibits in the future arrangements 

 of the Museum and will be of great aid in (1) featuring those 

 of especial importance, (2) providing the strong illumination 

 necessary to observe very small objects, and (3) solving the 

 problem of combining the large proportion of wall space required 

 for fossil exhibits with adequate lighting throughout. 



The Second International Congress of Eugenics in September 

 held its general meetings in the Age of Man Hall, necessitating 

 the removal of a part of the exhibits and the installation of a 

 number of temporary exhibits appropriate to the interests of the 

 Congress. Some of these exhibits still remain, pending a re- 

 arrangement of the Proboscidea collections in conformity with 

 the revision of this order by Professor Osborn noted below. 



Professor Osborn has been engaged during the year upon 

 a phylogenetic and systematic revision of the Proboscidea. The 



Museum has acquired in the course of the last 

 Researches twenty years a splendid collection of fossil pro- 

 Publications DOS rideans, rivaled only by the great series in the 



British Museum. Much of this collection is new 

 and undescribed and is of great value in tracing the evolution 

 and phylogeny of the mastodons' and elephants. With the aid 

 of this new evidence Professor Osborn has been able to separate 

 twelve distinct phyla of proboscideans of which the most ex- 

 tended is that of the American Mastodon, traced back to the 

 Lower Oligocene of Egypt. 



