A FEW GRATUITOUS HINTS TO INVENTORS. PROFESSOR AGASSIZ ON OUR COLLEGES. DRAPER AND TYNDALL ON THE INVISIBLE RAYS. RAPID TRANSIT IN NEW YORE. SCIENTIFIC AND PRACTICAL INFORMATION. PORTABLE DRY INK. TO CLEAN SILVER. NEW USES OF HYDRATE OF CHLORAL. AN INDELIBLE RED INK. THE TRANSIT OF VENUS., scientific american, 1873-03-01
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