Features of the Darwin specimen sheets
Collected plant specimens are preserved for the future by pressing and then drying them. They are then carefully mounted on to paper so that the features that distinguish the particular plant can be seen; some of these, for example miniscule hairs and glands, are only revealed under magnification.
When Henslow received Darwin’s plants in Cambridge, he mounted them on to about 950 herbarium sheets and added information to them. You can explore one of these sheets in detail below by dragging your mouse across the image.