Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 245
les arranging themselves to form hexagonal stars. Froma central nucleus shoot six spiculee, every two of which areseparated by an angle of 60°. From these central ribssmaller spiculse shoot right and left, with unerring fidelityto the angle 60°, and from these again other smaller onesdiverge at the…
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