. First forms of vegetation. Botany; Cryptogams. 172 IIRSTFORMS OF VEGETATION. own leaves ; but strange to say, these are the least valuable species to the dyer. The lichens which are richest in colorific principles are crustaceous species growing on rocks, and utterly destitute of. Fig. 15.—RoccELLA tinctoria. colour in their natural state ; and it is one of the most striking triumphs of chemistry as applied to the arts and manufactures, that by its means some of the finest shades of red, purple, and yellow are extracted from such unlikely substances. The lichen popularly known as Orchil (Fig
. First forms of vegetation. Botany; Cryptogams. 172 IIRSTFORMS OF VEGETATION. own leaves ; but strange to say, these are the least valuable species to the dyer. The lichens which are richest in colorific principles are crustaceous species growing on rocks, and utterly destitute of. Fig. 15.—RoccELLA tinctoria. colour in their natural state ; and it is one of the most striking triumphs of chemistry as applied to the arts and manufactures, that by its means some of the finest shades of red, purple, and yellow are extracted from such unlikely substances. The lichen popularly known as Orchil (Fig. 15) affords a remarkable illustration of the extent to which colorific principles, are developed in these out- wardly hueless plants. It derives its generic name Roccella from a Florentine family called Rucellai, whose founder, for a long time a trader in the Levant, discovered in the sixteenth century the art of preparing a most valuable dye from it, by. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Macmillan, Hugh, 1833-1903; Macmillan, Hugh, 1833-1903. Footnotes from the page of nature. London, Macmillan
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1874
