From Leonard Darwin 7 January 1878
Brompton Barracks, | Chatham.
Jan 7th. 1878
Dear Father
The following is the work on the lamp black so far. Boiled 25 grains in water; filtered; obtained a clear solution with a very slight green tint; evaporated to dryness and a residue was left; this may have been oil that came through with the hot water; then I red heated the residue, and a good deal went away with badly smelling fumes; there only remained .08 grain I think that this contained a trace of iron; and that most of it was some soda salt, but I cannot be sure.1 The result in numbers is
Percentage of organic matter that came through with the water—– | 1.92 |
Percentage of inorganic matter soluble in water.—– | 0.32 |
2.24 |
Your affec son | L. Darwin.
Footnotes
Summary
LD’s chemical analysis of lamp-black.
Letter details
- Letter no.
- DCP-LETT-11316
- From
- Leonard Darwin
- To
- Charles Robert Darwin
- Sent from
- Brompton Barracks, Chatham
- Source of text
- DAR 209.8: 153
- Physical description
- ALS 2pp
Please cite as
Darwin Correspondence Project, “Letter no. 11316,” accessed on 24 April 2024, https://www.darwinproject.ac.uk/letter/?docId=letters/DCP-LETT-11316.xml