Description

Black and white photograph of an algae known as Arachnoidiscus Ehrenbergi Bailey. Original caption on photograph front: "No 4 Arachnoidiscus Ehrenbergi Bailey Tolles 1/4 [pi] Beypiece-" Original caption on reverse: "Photo - micrographs 1871-72 C. S. Minof See Report of Department of Physics by Professor E. C. Pickering, President's Report, 1871 -72. p 101."