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This represents an institutional ownership stamp found on the original page.
This refers to the "Musaeum Hermeticum Reformatum et Amplificatum" original: "The Reformed and Enlarged Hermetic Museum", which was the most complete edition of this famous collection of alchemical texts.
In this context, "Chemical Tracts" refers to specialized treatises or essays documenting the secrets and experiments of alchemy.
James Elliott and Co. was a London publisher specializing in occult and mystical works during the late 19th-century occult revival. Many of these editions were prepared by the scholar Arthur Edward Waite.