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Rh  of browns and wrappings, 142 — of printings, 136 — of writings, 138 Wet end of paper machine, 21 Wildness in paper, 112 Wire mark in paper, 84 Wood fibres, 5, 62, 110 — microscopical examination of, 110 — pulp, 13 — beating, 13 — chemical, 3, 13, 110 — mechanical, 3, 6, 13, 110 Wood, mechanical, testing for, 106 — Mitscherlich, 62 Woolley paper-testing machine, 100 Wove dandy roll, 23 Wrapping papers, 55 — — manufacture of, 56 Writing papers, 39 — — loading in, 20, 64 tables of sizes, weights, and prices, 138

papermaking machine, 25