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To Correspondents—Our Index, & c - pp410 - 411
doi:10.1038/scientificamerican09131851-410a
Short Conversations on Mechanics.—No. 6 - p411
doi:10.1038/scientificamerican09131851-411b
Substitute for Hops in Making Beer - pp411 - 412
doi:10.1038/scientificamerican09131851-411e
To Remove Stains from Mourning Dresses - p412
doi:10.1038/scientificamerican09131851-412a