Letter 11284A Darwin, C. R. to Key, Axel 20 Dec 1877 Summary Add + Expresses his gratitude and admiration for AK's and M. G. Retzius's Studien in der Anatomie des Nervensystems und des Bindegewebes (2 vols. 1875–6). Transcription The full text of this letter is not yet available online. Footnotes Add