Obituary notices: William Henry Perkin, 1838–1907; Robert Warington, 1838–1907; August Dupré, 1835–1907; John Clark, Ph.D., F.I.C., 1844–1907; Frederick James Montague Page, 1848–1907; Sir David Gamble, Bart., K.C.B., 1823–1907
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