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 12 February 2016, http://www.darwinproject.ac.uk/DCP-LETT-8068