Versuche über Pflanzen-Hybriden
This is a German scientific treatise on plant hybrids by the Moravian monk Gregor Mendel, printed in Brünn in 1866 for readers of natural history and botany. Its pictures are geometric diagrams of a celestial sphere with labelled poles, zenith, horizon and arcs, drawn in fine black line on cream paper, offering a designer a clean model of precise technical linework and lettered labels.






