32 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1922. 



inclii(lin<r a series of uncut dianionds from the mines of the Arkansas 

 Diamond Corporation, JNIurfreesboro, Ark.; a unique cut gem of 

 orthoclase fi-om Mada<iascar ; a bhie ziix-on from Australia; and a 

 series of fresh-Avater pearls from tlie rivers of the Mississippi Valley. 

 A number of individual gifts are also recorded. 



Paleontological material Avas received from Mexico, Central and 

 Soutli America, India, and several European localities, these being 

 chiefly Mesozoic and Cenozoic, while numerous collections from 

 Paleozoic rocks of the United States and Canada were made by the 

 curator or presented by interested friends. Unusually well pre- 

 served cetacean remains obtained in the Miocene deposits along 

 Chesapeake Bay; valuable reptilian material acquired by exchanges; 

 skulls and bones of extinct buH'aloes, presented by the John A, 

 Savage Co., Crosby, Minn.; and remains of the Beresovka mani- 

 moth, are among the notable accessions of vertebrate material. 



Mineral and mechanical technolocjy. — In the division of mineral 

 technology attention was confined entirely to a more permanent 

 and complete arrangement of the exhibits already on hand, and 

 new material consisted chiefly of photographic transparencies which 

 weie installed in the respective exhibits to which they referred. 

 Apart from this work, the division was chiefly engaged in coopera- 

 tive educational work with the Pennsylvania State Board of Edu- 

 cation through Mr. Samuel S. Wyer, of Columbus, Ohio. The 

 plans of the State Educational Board call for revision of the sev- 

 enth-grade geography course to include the study of the State's 

 mineral resources. The extent of the division's cooperation may 

 be judged from the fact that it has supplied a considerable amount 

 of the data for text and illustrations from the models of the many 

 mineral industries exhibited in the Museum. 



The division of mechanical technology was extremely busy, pri- 

 marily, in regrouping its collections and rearranging objects in the 

 collections so as to tell a story rather than merely represent a 

 period in development, in an endeavor to impress the student with 

 the significance of the material rather than its mere existence; 

 and. secondarily, through the receipt of over 100 per cent more 

 objects than Avere received the preceding j'ear. In the line of 

 special investigations, those inaugurated last year, particularly with 

 regard to the developments in aeronautical engineering, were con- 

 tinued. 



Textiles, wood technology, foods, and medicine. — The collections 

 under the supervision of the curator of textiles, which, besides 

 textiles, embrace wood technology, food, medicine, and miscellaneous 

 organic products, were increased by many gifts and by transfer 

 and loan of property from other Government bureaus amounting 

 to nearly 3,000 objects. The most important of these are as follows: 



