Subject ASC0003jzo
Journal of the Royal Microscopical Society.
1888:pt.1:no.1-3 (1888), Page 120 (1878-1968.)
New York Botanical Garden, LuEsther T. Mertz Library
BHL Page 31221825
Keywords
microscope air-bubbles. microscopy focal plane air bubbles circle concentric air bubble bubble air round centre focus plane oblique light