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From Joseph Beete Jukes   27 February 1860


Believes in the "perfect indefiniteness & frequently the vast length of the interval" between consecutive geological formations. Thus has little respect for arguments against CD based on the absence of transitional forms in the geological record. States that species found through series of beds do vary: some Silurian species have many synonyms which are really varieties of greatly differing ages. CD’s theory accounts for the progressive inprovement, multiplication and increase in complexity that can be seen, but which may often be only relative.

Author:  Joseph Beete Jukes
Addressee:  Charles Robert Darwin
Date:  27 Feb 1860
Classmark:  Kinnordy MS, Charles Lyell’s journal V, pp. 125–7
Letter no:  DCP-LETT-2716A
Document type
letter (1)
Darwin, C. R.[X]
Jukes, J. B.[X]