Report of the President 53 



on the panel to the left of the entrance of the Tertiary 

 Mammal Hall. Most of the material secured by the field 

 expeditions of 191 1 has been prepared for study, and for 

 mounting in exhibition groups where desirable. Some pro- 

 gress has also been made in the preparation of the 191 2 

 collections. 



The transfer of the Osborn Library to the Museum, and 

 its cataloging and general supervision and care under direction 

 of the Librarian, have made it more than ever valuable and 

 convenient for research work in Vertebrate Palaeontology. 



Publication and Research. — Research work was con- 

 tinued as usual, by Professor Osborn and Dr. Gregory upon 

 the Titanothere Monograph for the United States Geological 

 Survey, by Professor Osborn and Mr. Brown upon Cretaceous 

 Dinosaurs, by Dr. Matthew and Mr. Granger upon Lower 

 Eocene mammals and by Professor Osborn and Dr. Matthew 

 upon the Evolution of the Horse. In addition a number of 

 valuable researches upon Museum material have been con- 

 tributed by scientific authorities not upon our staff, notably, 

 Dr. von Huene upon Permian vertebrates, Dr. Shufeldt upon 

 Pleistocene birds and Dr. Cockerell upon Tertiary land shells. 



Sales and Exchanges. — A number of valuable duplicate 

 specimens and casts have been sent to other museums during 

 the year. Of these the most important are a skeleton of the 

 Primitive Ungulate Phenacodus, sent to the Senckenberg Mu- 

 seum, two fossil skulls to the British Museum, and five copies 

 each of two splendid casts recently prepared, the skull of 

 Tyrannosaurus and skeleton of Eryops, sold to different muse- 

 ums. The net total of these sales, excluding unfilled orders, 

 is $2,350. Exchanges with the University of California, 

 Munich University and the Geological Survey of India have 

 been arranged during the year. 



Photography. — Dr. Gregory and Mr. Anderson have 

 devoted considerable time during the year to the preparation 

 and supervision of illustrations for Dr. Elliot's monograph of 

 the Primates. Mr. Anderson has also prepared and photo- 



