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,'''' icill 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 National Museum has publ'ished a pamphlet, part 

 K, Bulletin 39, containing directions for collecting and 

 preparing fossils, by Chaiies Schuchert ; and another, 

 part B, Bidletin 39, collecting recent and fossil plants, 

 by F. H. Knoxiiton. 



Fig. 3. — Skeleton of a Radiolarian Very Greatly Enlarged. 



