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Tunnel Under the Hudson River at Albany - p217
doi:10.1038/scientificamerican03271852-217
New Illuminating Apparatus for Lighthouses - p218
doi:10.1038/scientificamerican03271852-218a
Recovering Gold from the Alkaline Cyanide - p219
doi:10.1038/scientificamerican03271852-219b
Improvements in Truss Girders for Bridges - p220
doi:10.1038/scientificamerican03271852-220a
The Human Hair, Its Treatment, Oils, &C - p221
doi:10.1038/scientificamerican03271852-221a
