Third installment of Thomas Henry's essay on wool, silk and cotton as materials for dyeing. It discusses mordant bases: alum, tin, copper, lead and iron salts, and how each is used for wool, silk and cotton, including the calico printer's aluminous liquor made from alum and sugar of lead. It then begins a detailed, step-by-step account of the Adrianople (Turkey) red process on cotton, covering barilla leys, oil and sheep's dung liquors, and galling, and breaks off after the ninth operation with the note that it will be concluded in the next issue.