To Francis Darwin [before 15 April 1873]1
Monday—
Dear Frank
I send straight to Pantlludw2 a bottle of formic acid & litmus paper (you can blue it with smelling salts) will you & Amy search some mountain tarns immediately & if you can find any not developed spawn, keep 2 basons in a warm room & add 6 drops of acid to one; & then even in a fortnight you ought to perceive a difference; & I dare say Amy wd observe for another week or two after you are gone— that is if the whole thing does not go squash3
Yours affectly | Ch. D.
Footnotes
Summary
Sends to Pantlludw [North Wales] bottle of formic acid. FD and Amy [Darwin] can search for spawn. If found, keep in two basins and add 6 drops of acid to one and look for differences.
Letter details
- Letter no.
- DCP-LETT-8848A
- From
- Charles Robert Darwin
- To
- Francis Darwin
- Source of text
- DAR 271.4: 6
- Physical description
- LS 2pp
Please cite as
Darwin Correspondence Project, “Letter no. 8848A,” accessed on 21 September 2024, https://www.darwinproject.ac.uk/letter/?docId=letters/DCP-LETT-8848A.xml
Also published in The Correspondence of Charles Darwin, vol. 21