FOSSILS, AND HOW THEY ARE FORMED 17 



REFERENCES 



A very valuable and interesting article by Dr. Charles 

 A. White, entitled " The Relation of Biology to Geo- 

 logical Investigation,'''' xoill be found in the Report of the 

 United States National Museum for 1892. This com- 

 prises a series of essays on the nature and scientific uses 

 of fossil remains, their origin, relative chronological 

 value and other questions pertaining to them. The United 

 States Nat'ional Museum has published a pamphlet, part 

 K, Bulletin 39, conta'ining directions for collecting and 

 preparing foss'ds, by Charles Schuchert ; and another, 

 part B, Bulletin 89, collecting recent and fossil plants, 

 by F. H. Knoiclton. 



Fig. 3. — Skeleton of a Radiolarian V^ery Greatly Enlarged. 



