Dissertazione epistolare del fosforo minerale ò sia della pietra illuminabile bolognese
A 1698 Italian epistolary dissertation by Luigi Ferdinando Marsili on the Bologna luminous stone, a mineral phosphorus, printed in Leipzig and held by the Wellcome Library. Its plates are hand-drawn, pen-and-ink studies of crystal clusters and mineral lumps shown in tonal hatching on cream paper, with a designer able to draw on their crisp faceted structure and cross-hatched shading for geometric or stone-texture work.
