144 Scientific Intelligence. 



beneath thin sheets of eruptive rock occupying a geologic 

 horizon which is probably at the base of the carboniferous lime- 

 stone. The Cripple Creek gold district was examined aDd 

 reported on by Mr. Cross, and the ore deposits were studied by 

 Prof. Penrose. An important work has been done by Mr. Diller 

 in the preparation of the educational series of rocks. The work 

 is far advanced and with the accompanying bulletin the speci- 

 mens are expected to be soon ready for distribution. Other 

 valuable results have been accomplished by the Weed and 

 Eldridge parties in the Rocky mountains; by the Chamberlin 

 party on glacial deposits; by the Turner, Lindgren and Law- 

 son parties in the Pacific region. The director personally made 

 a wide reconnaissance survey over the mining fields of the west- 

 ern United States; thus bringing the survey in touch with a 

 large number of persons taking a vital interest in its proceedings. 

 The Paleontological division was cramped in its work by the 

 smallness of appropriations but several parties were in the field 

 and work already begun was continued with as much vigor as 

 was possible under the circumstances. 



The division of Hydrography is the continuation of the work 

 originally assigned to the irrigation division of the survey of 1888, 

 and its investigations are now confined to questions of water 

 supply for the arid region including the location and the volume 

 of rivers. The work has been chiefly done under the charge of 

 Mr. Newell ; and investigations have been carried on during the 

 year in the States of Arizona, California, Colorado, Idaho, Kansas, 

 Montana, Nebraska, Nevada, New Mexico, N. and S. Dakota, 

 Oregon, Texas, Utah, Washington, Wyoming and, to some 

 extent, in the Eastern States. 



The " Mineral Resources of the United States " prepared by Dr. 

 Day will hereafter appear as a part of the Director's Annual 

 Report, it will constitute parts iii and iv of the present annual 

 report. 



The organization of the topographic branch has been radically 

 changed. It is now consolidated under the name of topographic 

 branch of the survey under the charge of Mr. Gannett, with two 

 divisions, one of triangulation and the other of topography, and 

 the work is classified by region into four sections, as the Atlantic, 

 Central, Rocky mountain and Pacific sections. The work has 

 been pushed forward with renewed energy and precision. 



The other departments of the survey are alike in admirable 

 organization, and the report presents a thoroughly business-like 

 account of its work, which indicates that the survey has lost none 

 of the admirable qualities of its former administration, and that 

 its director is as excellent an executive as geologist. h. s. w. 



2. XI. S. Geological Survey ; recent Publications.— The follow- 

 ing portions of the sixteenth annual report have already appeared : 

 Sixteenth Annual Report of the Director, 189^-95 / by Charles 

 D. Walcott, 4°, pt. I, pp. 130, pi. i. The operations and results 



