Sand Dollar Embryo, 1975

Black and white photograph of microscopic image of sand dollar embryo. The image shows four cells with the birefringence of the spindle fibers contained within them. Whether the birefringence is bright or dark depends on the orientation of the spindle. The main object of polarized light microscopy is contrast, and this is evident in this picture. Shinya has written on the back of the photograph: 75e22I From 17A RCF-3.5 15sec@F/11 2mD