1 8 Report of the President. 



us the Middle Eocene stage in the evolution of the Horse, inter 

 mediate between the Lower Eocene and Oligocene horse skel- 

 etons now on exhibition. 



The field explorations have yielded several important acces- 

 sions. The Harriman expedition to Bone Cabin Quarry suc- 

 ceeded in obtaining a considerable part of the skeleton of 

 another of the small Dinosaurs of the Jurassic Period. These 

 reptiles are as yet incompletely known, but probably they were 

 characteristic animals of the dry land during the Age of Rep- 

 tiles. 



The expedition to the Cretaceous of Montana was a very 

 successful one. By dint of extensive and heavy quarrying the 

 greater part of the skeleton of the giant carnivorous Dinosaur, 

 Tyrannosaurus, was obtained. 



. From the Bridger Basin was obtained a number of speci- 

 mens of which the most important is a mountable skeleton of 

 the four-toed horse, Orohippus. Three years of exploration in 

 this basin, the richest locality in this country for fossil verte- 

 brates of the Eocene period, have added to our collections a 

 splendid series of skulls and skeletons, especially of the smaller 

 species hitherto very imperfectly known. 



Department of Anthropology. — Considerable progress 

 has been made in cataloguing the new collections received 

 during the year and also several not previously catalogued. 



The problem of storing duplicate and study specimens has 

 been a difficult one. Early in the fall the rooms vacated by 

 the Department of Preparation and Installation were assigned 

 to this department and were equipped with a number of large, 

 storage cases. This additional room has made it possible to 

 classify a large amount of material and to arrange it satis- 

 factorily. 



The time of Dr. Clark Wissler, the Acting Curator, has 

 been taken up with the routine duties of his office, the care 

 of the exhibition halls and the general supervision of the work 

 of the department. He has continued his investigations of 

 the ethnology of the Plains Indians, giving special attention 

 to their material culture, and in addition, he is engaged in a 



