264 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1921. 



the benefit of the scientific visitor the technical names are intro- 

 duced in a subordinate position. 



Geological phenomena. — The line of exhibits through the center 

 of the hall comprising large objects of geological and paleontological 



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interest, each of which illustrates some definite chapter in the earth's 

 history, will perhaps be most attractive to the majority of visitors 

 (pi. 2, fig. 1). Near the entrance, as an example, is a slab of Cambrian 

 sandstone, mounted as it was quarried out of the solid rock, and 



