To Daniel Oliver 15 November 1871
Down, | Beckenham, Kent.
Nov 15 1871
Dear Professor Oliver
Will you have the kindness to give me a small piece of information. Is it now believed that the spungeoles at the extremity of the rootlets secrete carbonic acid or any other element in a nascent state, which acts on bones & rocks so as to obtain the necessary phosphates & alkalis?1
I remember years ago having seen a statement to this effect, & I am anxious to know whether it is now thought true.2
Pray excuse my troubling you & believe me | yours sincerely | Ch. Darwin
Is it now thought that the spongioles of rootlets secrete carbonic acid which acts on bones and rocks?
Please cite as
Darwin Correspondence Project, “Letter no. 8068,” accessed on 8 December 2016, http://www.darwinproject.ac.uk/DCP-LETT-8068