Soak any part of a plant in nitric acid for a short space of time,
and all power of cohesion will be lost by the vessels, which will
become transparent, and be easily separable from each other by gentle
dissection. So complete will be the effect, that even the most
delicate cells of the cellular tissue will become disengaged from each
other, and may be examined singly with perfect ease. This discovery
will enable persons who have not compound microscopes, and delicate
directing instruments, to anatomize plants with facility.