132 Field Museum or Natural History — Reports, Vol. IV. 



work carried on has been, in addition to the moving of the laboratory 

 and specimens to new quarters, chiefly the preparation of the Eocene 

 material obtained by the expedition to Utah in 1910. Chief in im- 

 portance of the material prepared, and alone of sufficient value to repay 

 several times the cost of the expedition, is a skull of Eobasileus. This 

 skull, of which only two others are known, is of large and striking 

 form and well preserved. Good skulls of two genera new to science 

 which were obtained by the expedition have also been prepared. 

 There have also been prepared from this series five skulls and four 

 lower jaws of Metarhinus. This is much the largest collection of this 

 genus ever made, the genus itself having been known for only three 

 years. The material contains two new species and will furnish several 

 other new characters. Other material prepared includes three skulls 

 and one pair of lower jaws of Dolichorhinus, one skull of Amynodon, 

 one skull of Frotelotherium, one skull and one pair lower jaws of 

 Telmatherium, one skull and one pair of lower jaws of Mesonys, and 

 one lower jaw of the large carnivore Harpagalestes. The large skull 

 of Brontotherium ramosum obtained by the expedition of 1906 has 

 been placed on exhibition with the other titano there skulls. The 

 chemical laboratory at Jefferson Avenue was available for use during 

 part of the year and several complete quantitative analyses were 

 made there. Among these was one of the Noon meteorite and several 

 of the Brazilian favas associated with the diamond. The latter 

 analyses showed the presence of two minerals new to science. Re- 

 moval of the laboratory during the latter part of the year to a new 

 location compelled the discontinuance of this work until new facilities 

 can be provided. Several of the sections of iron meteorites, which had 

 been poorly etched when received, were repolished in preparation for 

 proper etching. Subsequent to the moving of the mineral collection 

 the rearrangement of the study series of this collection was under- 

 taken and completed for the silicates. The specimens comprised in 

 this group were placed in individual trays, labelled and distributed 

 according to species and localities. Preparation of plans for the 

 Departmental offices and laboratories in the new building occupied 

 the time of the staff during part of the year. The plans made were 

 worked out with considerable care as to detail, and , it is believed that 

 the equipment planned for will provide the fullest possible facilities 

 for the various lines of work which are to be undertaken. Of the 

 four large bird groups being produced under the Field-Sprague 

 Ornithology Fund one (a habitat group of the Loon) has been 

 opened to the public, and the others are all in an advanced stage 

 of preparation. The unusual amount of accessory material — leaves, 



