REPORT OF ]SrATIO:N'AL MUSEUM, 1920. 107 



rapliy and collecting of Upper Cambrian fossils in Wisconsin in 

 association with Dr. W. O. Hotclikiss, State Geologist, the results 

 of Avhich have already received notice. An assistant in the employ 

 of Mr. Frank Springer continued the systematic study of strata 

 containing fossil echinoderms at St. Paul, Indiana. 



Mr. Shannon of the division of applied geology, on his own initia- 

 tive, occupied about ten days in visiting points of especial interest 

 among the trap quarries about New Haven and Meriden, Connecticut, 

 the old tungsten mine of Long Hill in Trumbull, feldspar quarries in 

 Portland, and the old lithia and cobalt mines in Chatham. The ma- 

 terials collected on this trip have been made the object of investiga- 

 tion as noted elsewhere. Assistant Curator Foshag visited the 

 famous mineral locality of Amelia, Virginia, the old Tilly Foster 

 iron mines of Brewster, New York, and was given a detail of six 

 weeks to be spent in California. On the latter trip he visited the 

 borax mines at Lang and Borate, the lithia mines at Pala, the silver 

 mines at Calice and Randsburg, the quarries of the Eiverside Port- 

 land Cement Company at Crestmore, Searles Lake, and the mercury 

 mines at New Almaden. The results of this trip have not as yet 

 arrived at the Museum and a report on the same cannot be made at 

 the present time. 



Little has been added to the vertebrate collections through field 

 explorationsexcepting those directly under the TJ. S. Geological Sur- 

 vey. Mr. Gilmore was, however, detailed to visit the American 

 Museum of Natural History for the purpose of making comparisons 

 of certain specimens in the national collections from the Potomac 

 formation of Maryland with identified materials in the collections 

 of that institution. His results have led to discoveries which promise 

 to be of paleontological as well as geological interest. 



Work on the collections. — The growth of popular interest in that 

 portion of the exhibition series devoted to the rare earths and rare 

 metals made necessary an amount of rearrangement which has in- 

 volved changes of considerable magnitude, together with the intro- 

 duction of much material that was new. Other installations include 

 the unique sheet of native copper from Bolivia and the large slabs 

 of Tennessee marble already referred to. The work of reweighing. 

 measurinir. and catalosfuino: the stones included in the collection of 

 gems, mentioned as in progress in my last report, has been com- 

 pleted. This collection has been augmented chiefly in that portion 

 showing the stones in their natural as well as cut condition: other- 

 wise, the principal changes are in rearrangement. This work has 

 been carried on practically in its entirety by Miss Margaret Moodej'. 



The newly appointed a.ssistant curator in the division of miner- 

 alogy was confronted with a large quantity of material which 

 had accumulated during the two years that the division was 



