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Letter and/or further information available at https://www.darwinproject.ac.uk/letter/DCP-LETT-7070.xml.
Also published in The Correspondence of Charles Darwin, vol. 18
The Zoological Garden has only one old adult male of Limulus. When there were females, eggs were never observed.
Encloses a separate letter [7071] about AD’s scheme [for a zoological station].
Suggests AD be cautious [in his work]. "Caution is almost the soul of science."