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To G. H. Lewes   7 August [1868]

Summary

Thinks GHL’s articles are quite excellent; hopes they will be republished.

Discusses adaptation. Doubts whether similar conditions without selection can produce similar organs independent of blood relationship: "resemblances due to descent and adaptation can commonly be distinguished".

Discusses luminous insects, electrical organs of fish, thorns and spines.

Author:  Charles Robert Darwin
Addressee:  George Henry Lewes
Date:  7 Aug [1868]
Classmark:  DAR 185: 42; Argyll Papers (NRAS 1209/985)
Letter no:  DCP-LETT-6308