From William Turner 3 January 1870
6 Eton Terrace | Edinburgh
Janr. 3d. 1870
My Dear Sir
Kölliker of Würzburg and Langer of Vienna are the best authorities on the development of the mammae & the glands of the skin.1
They both agree in describing the mammary gland as developed before the nipple—2 Kölliker figures in a 5 months human embryo the first indications of a mamma, and the horny layer of the epidermis is prolonged over its surface without any appreciable elevation corresponding to a nipple—3
Langer states that a distinct lens shaped body may be recognised in the mammary region of a human embryo, 7 centimetres long, which is the rudimentary gland, but at this early stage no trace whatever of mammary ducts can be recognized in it—4
In a female human embryo 10 centimetres long, he could not trace mammary ducts in the lens shaped body—
When hair first begins to protrude through the skin of the embryo then the mammary ducts may be seen in different stages of development.
Langer concludes that the first development of the mammary gland is connected with the existence of a special body, in which the ducts arise independently, & are not involutions of the external skin—
At first the ducts possess one common orifice— on the surface of the skin, but with the development of the nipple each of the main ducts opens independently on the surface—
It is clear therefore that the nipple is a structure developed in connection with the system of excretory ducts, and it is equally clear that the ducts are not developed until the position & general form of the mammæ have been mapped out in the skin—
I must apologize for the delay in replying to your queries but about the time that I received your letter a great whale came ashore here, and the dissection which I undertook so absorbed my time and thoughts that I fear many matters which should have been attended to were for a time at least forgotten—5
I remain | Yours sincerely | W Turner
CD annotations
Footnotes
Bibliography
Descent: The descent of man, and selection in relation to sex. By Charles Darwin. 2 vols. London: John Murray. 1871.
Kölliker, Rudolf Albert von. 1855. Handbuch der Gewebelehre des Menschen. Für Aerzte und Studirende. 2d edition. Leipzig: Wilhelm Engelmann.
Langer, Karl von. 1852. Über den Bau und die Entwicklung der Milchdrüse bei beiden Geschechtern. Denkschriften der kaiserlichen Akademie der Wissenschaften, Mathematisch-Naturwissenschaftliche Classe 3 (pt 2): 25–38.
Summary
On the development of the mammae and the glands of the skin. R. A. v. Kölliker and Carl von Langer are the authorities [See Descent 1: 209].
Letter details
- Letter no.
- DCP-LETT-7088
- From
- William Turner
- To
- Charles Robert Darwin
- Sent from
- Edinburgh
- Source of text
- DAR 80: B158–9
- Physical description
- ALS 4pp †
Please cite as
Darwin Correspondence Project, “Letter no. 7088,” accessed on 19 October 2024, https://www.darwinproject.ac.uk/letter/?docId=letters/DCP-LETT-7088.xml
Also published in The Correspondence of Charles Darwin, vol. 18