Prepared microscope slide. Chordata: Amphibian spleen (frog) sec.
These prepared slides are of very high quality produced in the U.S. by Lee Gonzales, a licensed histologist. The attached image of fish spleen is of the slide being offered, at 400x.
A discussion of the lymphatic system, including the spleen, may be found HERE . It is from Orange County Community College, State University of New York.
For information about the Accu-Scope 3012 Binocular Microscope with E Plan Achromat Objectives, click HERE.
Forensics Lab Supply Number 3862187.
"sec." means "section".