58 SMITHSONIAN: MISCELLANEOUS COLLECTIONS [voL. 48 
found in almost every State in the Union and almost every land on 
earth. Immense beds exist, for example, at Nottingham, Md. ; Rich- 
mond, Va.; Keene, N. H.; Monterey, Santa Monica, Rodondo Beach, 
Cal.; near Spokane, Wash. ; etc.; while smaller deposits are frequent 
in many other localities. In foreign lands there are large deposits 
at Sendai, Japan; Ananino and Simbirsk, Russia; Alicate, Sicily; 
Bilin, Bohemia ; Luneberg, Germany; Mors, Jutland; Oamaru, New 
Zealand; Springfield, Barbados; etc. 
The cleaning of diatoms of organic matter and the preparation of 
these and fossil forms as permanent microscopic mounts cannot be 
entered into here. The processes are easily learned from any good 
work on the microscope. 
SMITHSONIAN INSTITUTION, 
Wasuincton, D. C., March, 1905. 
