NO. 4 COOPERATIVE WORK OF THE INSTITUTION I9 



Experiments in heredity. — Since 1912 Dr. Bartsch has been en- 

 gaged in a series of experiments in heredity under the joint auspices 

 of the Smithsonian and Carnegie Institutions. Molkisks were col- 

 lected at the Bahamas, Porto Rico, and Curacao and transplanted 

 to the Florida Keys and the Tortugas. Many points of cross breed- 

 ing have resulted. 



Cooperation with the Chemical Warfare Service. — Through breed- 

 ing experiments conducted by Dr. Bartsch upon local land mollusks 

 during the years from 1899 to 1907 was made possible the demon- 

 stration of a method by which the garden slug could be used as a 

 poison gas detector. Dr. Bartsch was detailed to the Chemical War- 

 fare Service for a period of 11 days working upon this problem. 



Other cooperation by the Division of Mollusks. — Dr. W. H. Dall 

 reports cooperation with the, Wagner Free Institute of Philadelphia 

 in preparation of a report on the Florida Tertiary Collection ; with 

 the Bishop Museum of Honolulu on the Molluscan fauna of the 

 Hawaiian and Palmyra Islands ; with the Museum of Comparative 

 Zoology on the Blake and Albatross dredgings and the Wild Duck 

 collections ; with the Department of State on the Alaskan Boundary 

 (the conclusions of, this report were exactly adopted in the subse- 

 quent arbitration) ; with the California Academy of Sciences in a 

 study of the landshells and fossils of the Galapagos Islands ; with 

 the Peruvian government ; the Brooklyn Institute, and the Harriman 

 Alaska Expedition and with the U. S. Fish Commission in a study 

 of the Molluscan fauna of Porto Rico. 



DEPARTMENT OF GEOLOGY 



Services as Expert on Structural Materials. — In 1 881 -1882 the 

 Head Curator of Geology was detailed for work with the Tenth Cen- 

 sus in connection with the building stone industry. This work in- 

 volved the identification of several thousand specimens and the 

 compilation of the matter relating thereto as finally published in the 

 quarto volume relating to this industry. During the Twelfth Census 

 he was again detailed for similar work, the results of which are to 

 be found in the report on Mines and Quarries (1912). In 1913 he 

 was detailed for services with the Lincoln Memorial Commission in 

 inspection of the quarries at Yule Creek, Colorado, and of the mate- 

 rial as delivered on the grounds in Washington. For like services he 

 has not infrequently cooperated with the Engineer in charge of 

 Public Buildings and Grounds ; the Architect of the Capitol ; and the 

 supervising architect of the Treasury ; and with associations and 



