English chemist William Hyde Wollaston invented the Scale of Chemical Equivalents which is explained in this publication along with a foldout plate illustrating Dr. Wollaston's Synoptic Scale of Chemical Equivalents.…

Illustrated with 20 hand-colored plates, Conversations on Botany is composed as a series of conversations between a mother and son about the principles of the Linnaean system of classification and elements of useful…

Hand-colored lithograph of corn cockle, Agrostemma githago. Class Decandria, order Pentagynia.

Hand-colored lithograph of common houseleek, Sempervivum tectorum. Class Dodecandria, order Dodecagynia.

Hand-colored lithograph of common dog rose, Rosa canina. Class Icosandria, order Polygynia.

Hand-colored lithograph of the common red poppy, Papaver rhoeas. Class Polyandria, order Monogynia.

Hand-colored lithograph of ground ivy, Glechoma hederacea. Class Didynamia, order Gymnospermia.

Hand-colored lithograph of common wallflower, Cheiranthus cheiri. Class Tetradynamia, order Siliquosa.

Hand-colored lithograph of common mallow, Malva sylvestris. Class Monadelphia, order Polyandria.

Hand-colored lithograph of birdsfoot trefoil, Lotus corniculatus. Class Diadelphia, order Decandria.

Hand-colored lithograph of tutsan, Hypericum androsaemum. Class Polyadelphia, order Polyandria.

Hand-colored lithograph of the common daisy, Bellis perennis. Class Syngenesia, order Polygamia superflua.

Hand-colored lithograph illustrating the parts of a flower, using the example of the common wallflower. Included parts are the flower, cup, corolla or blossom, stamen, pistil, seed-vessel, and receptacle.

Hand-colored lithograph illustrating the class Cryptogamia, containing a fern, moss, lichen, seaweed, and mushroom.

Hand-colored lithograph with examples of the 24 botanical taxonomic classes: Monandria, Diandria, Triandria, Tetrandria, Pentandria, Hexandria, Heptandria, Octandria, Enneandria, Decandria, Dodecandria, Icosandria,…

Hand-colored lithograph of germander speedwell, Veronica chamaedrys. Class Diandria, order Monogynia.

Hand-colored lithograph of spring crocus, Crocus vernus. Class Triandria, order Monogynia.

Hand-colored lithograph of common holly, Ilex aquifolium. Class Tetrandria, order Tetragynia.

Hand-colored lithograph of water mouse ear, Myosotis palustris, now known as the water forget-me-not. Class Pentandria, order Monogynia.

Hand-colored lithograph of snowdrop, Galanthus nivalis. Class Hexandria, order Monogynia.

Hand-colored lithograph of common mezereon, Daphne mezereum. Class Octandria, order Monogynia.

Hand-colored lithograph of flowering rush, Butomus umbellatus. Class Enneandria, order Hexagynia.

Alexander Marcet (1770-1822) was a Genevan physician who specialized in urinary calculi. Marcet was one of few medical practitioners of the time who used chemistry in their explanation and treatment of disease. He was…

The cover and title page are digitized from the first edition of this seminal work responsible for exposing dangerous adulterations to foods and beverages. Food and drug purity legislation followed later in the…

Friedrich Christian Accum or Frederick Accum (1769-1838) was a German chemist whose most important achievements included advances in the field of gas lighting, efforts to keep processed foods free from dangerous…