FOSSILS, AND HOW THEY ARE FORMED 17 
REFERENCES 
A very valuable and interesting article by Dr. Charies 
A. White, entitled “The Relation of Biology to Geo- 
logical Investigation,” will 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 published a pamphlet, part 
K, Bulletin 39, containing directions for collecting and 
preparing fossils, by Charles Schuchert ; and another, 
part B, Bulletin 39, collecting recent and fossil plants, 
by F. H. Knowlton. 
WL 
J 
Fig. 3.—Skeleton of a Radiolarian Very Greatly Enlarged. 
