92 REPORT OF THE SECRETARY. 



the corundum fields of that region, and Doctors Goocli and Hallock were 

 sent to the Yellowstone National Park to make special studies of the 

 geyser phenomena. Bulletins setting forth the results obtained will be 

 issued in the due course of time. 



In his capacity as a Curator of the National Museum, Profeissor Clarke 

 gave considerable time and attention to the arrangement of the mineral- 

 ogic collection to be exhibited at the New Orleans Exposition. 



For some time prior to the removal of the physical laboratory from 

 New Haven, experiments were made for the determination of high tem- 

 peratures by means of thermo-electric couples. This line of research is 

 of importance, opening up, as it does, a wider range of investigation than 

 had heretofore been possible. 



Before the close of the year there was sent to the press, a Bulletin by Dr. 

 Carl Barns, on the Electric and Magnetic Properties of Iron-Carburets, 

 the result of laboratory investigations. 



The above reference to chemic work does not include analyses and 

 special mineralogic studies made by such divisions of the Survey as it is 

 not practicable to bring to Washington. 



STATISTICS. 



Mineral Resources of the United States. — As soon as it became practica- 

 ble to begin the collection of statistics concerning the mineral resources 

 of the United States other than gold and silver, the preparation of a sec- 

 ond report was taken up by Mr. Albert Williams, jr. While this report 

 follows the general form and scope of the previous volume, and is in itself 

 complete, from a statistical and trade point of view, it complements the 

 latter in the matter of description of localities, metallurgic processes, &c. 

 A new feature will be the introduction of a series of graphic tables show- 

 ing at a glance the progress in the several industries. While adding but 

 a trifle to the cost of the publication, this scheme contributes greatly to 

 its effectiveness. 



At the close of the year the statistics for 1883 were in shape for print- 

 ing, and progress made as far as jiossible in the collection of those for 

 1884. As soon as these are obtained the volume will be ready for the 

 printer. 



PUBLICATIONS. 



Believing that it will prove of value to the many readers of the Smith- 

 sonian Eeport, for jiurposes of reference, there is appended hereto, in 

 somewhat condensed form, the contents of the circular issued by the 

 Survey concerhing its publications. 



The publications of the United States Geological Survey are issued 

 in accordance with the statute approved March 3, 1879, which declares 

 that— 



" The publications of the Geological Survey shall consist of the an- 

 nual report of operations, geological and economic maps illustrating the 



