BENTLEY, WILSON A. (1865-1931) A select group of 4 photographs, comprising 2 frost studies and 2 early snow crystals. Gold-chloride toned photomicrographs from glass plate negatives, the frost studies each 4x3 inches (10.2x7.6 cm.) and the snow cyrstals with a sheet size of 3 1/2x3 inches (8.9x7.6 cm.). Circa 1903-1910
