From Francis Darwin [before 30 June 1872]1
New University Club, | St. James’s Street. S.W.
I couldn’t catch Garrod2 last night. He cannot give a definite answer without thinking over it. He thinks that in the quick beating of the heart in fear, it is not doing any more work— He cannot say even that it is actually working harder in hard exercise— Its seems to be rather complicated & not to easy to say what working harder means— He thinks that running & feeling the pulse wouldn’t prove anything.—3
Yrs F D
Quickening of heart-beat in fear. A. H. Garrod does not think that this means that the heart is working harder.
Please cite as
Darwin Correspondence Project, “Letter no. 8364,” accessed on 20 February 2017, http://www.darwinproject.ac.uk/DCP-LETT-8364