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Scientific American, Vol. 97, No. 4 (July 1907) (1907)

leaf 7

An illustration from Scientific American, Vol. 97, No. 4 (July 1907), 1907, leaf 7
indi- ticular variety of seed. cates. For instance, in an 8-inch lens, a 1-inch stop is parts of benzoic acid are added, after which it is al- There are at present supplied to seedmen or any one lowed to boil from five to ten minutes, until the mass f/S. The same lens at ten times its focal length… … Chickweed Seed, Natural Size and Enlarged. Sweet Clover Seed, Natural Size and Enlarged. Dandelion Seed, Natural Size and Enlarged. PHOTOMICBOGBAPHS WITHOUT A MICEOSCOPE.

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