DEPARTMENT OF LITHOLOGY AND PHYSICAL GEOLOGY. 243 



showing glaciation, sand erosion, ripple marks, and mud cracks, but 

 which need not be mentioned more in detail since they do not as yet 

 occupy their proper places in the systematic exhibits. 



Other miscellaneous materials on exhibition are mentioned in the fol- 

 lowing list : Eight geological maps of the United States and foreign 

 countries; one large map showing distribution of temperature in the 

 United States for the mouths of June, July, aud August; one large 

 map showing distribution of rain-fall for the same period; one large 

 map showing distribution of rain-fall for the mouths of December, Jan- 

 uary and February ; fifteen astronomical views comprising the Trou- 

 velot series of astronomical drawings ; twenty-three photographs of 

 stone quarries ; eight colored photographs of stone buildings; fifteen 

 geological views, including the large plates from Duttoirs atlas of the 

 Grand Canon of the Colorado of the West : seventeen models, or re- 

 lief maps. These last are given in detail below: 



I. Yellowstone National Park. Scale, 1 inch^l mile; horizontal and 

 vertical the same. Modeled by E. E. Howell. Issued by Ward & 

 Howell. Size, 4 feet lh inches by 5 feet 5 J inches. U. S. Geological 

 Survey. 



II. Elk Mountains of Colorado. Scale : horizontal, 1 inch=l mile; 

 vertical, 1 inch=2,G40 feet. Modeled by W. II. Holmes. Size, 2 feet 

 2 inches by 3 feet 8 inches. U. S. Geological Survey. 



III. Mount Vesuvius and Monte Somma, Italy. Compiled by Thomas 

 Dickert. Size, 2 feet 4| inches by 2 feet 4 J inches. Issued by Wai d 

 & Howell. 



IV. Geological model of Switzerland. Size, 11 inches by 24 inches. 



V. The Washoe District, Nevada. Scale, 1 incli=l,6C6 feet or 

 1:20000; horizontal and vertical the same. Geology by G. F. Becker. 

 Modeled by E. E. Howell. Size, 2 feet 5J inches by 3 feet 3 inches. 

 Issued by Ward & Howell. U. S. Geological Survey. 



VI. Leadville, Colo., and vicinity. Scale, 1 inch =800 feet, or 1:9000. 

 Geology by S. F. Emmons; modeled by E. E. Howell. Size, 2 feet 7£ 

 inches. Issued by Ward & Howell. U. S. Geological Survey. 



VII. The same in sections. U. S. Geological Survey. 



VIII. Gulf of Mexico. Scale: vertical, 1 inch=l,000 fathoms; ratio of 

 vertical to horizontal, 0.03. Size, 23 by 32 inches. Issued by Coast 

 aud Geodetic Survey. 



IX. The Yosemite Valley, California. Scale, about 4 inches to 1 mile. 

 Horizontal and vertical the same. Modeled by E. E. Howell from sur- 

 vey by King and Gardner. Size, 2 feet 5 inches by 4 feet one-half 

 inch. Issued by Ward & Howell. U. S. Geological Survey. 



X. The San Juan Mountains and mining regions. Scale, 1 inch=l 

 mile, or 1:63360; vertical scale three times the horizontal. Modeled by 

 T. W. Eglostein. Size, 4 -J by 3 J inches. U. S. Geological Survey, Capt. 

 George M. Wheeler in charge. 



XI. The Grand Cahou of the Colorado of the West aud Cliffs of 



