From Leonard Darwin [29 March 1872]1
The following is the solid content of the box, which I forgot to measure last week.
211.44 Cubic inches
Your affec son. | Leonard Darwin
Iron box of earth.
Measurement after being well dried before the fire. = 180.8 Cubic inches. This shews that it has diminished 10 per cent on the original earth, without taking into account internal shrinking, although cracks were visible on the surface.2
Earth dug out of ground & thrown up in fortification increase 〈of〉 above th of bulk.—3
Data relating to experiments; shrinkage of earth on drying.
Please cite as
Darwin Correspondence Project, “Letter no. 8260,” accessed on 23 April 2017, http://www.darwinproject.ac.uk/DCP-LETT-8260