CHAPTER 11 



LOUIS TREDERN— THE FORGOTTEN EMBRYOLOGIST 

 OF THE BEGINNING OF THE NINETEENTH CENTURY 



Before going into the characteristics of this turning 

 point in the history of embryology, which is known by Baer's 

 classical investigations and Pander's earlier work, it is 

 appropriate to review the dissertation of L. Tredern, 

 published in 1808. 



The personality of this embryo logist, who so brilliantly 

 began his investigative work and then unexpectedly disappeared 

 from the scientific horizon, had long remained veiled. 

 K. M. Baer, who was always actively interested in the history 

 of science in Russia, and particularly in his homeland in the 

 Prebaltic, took pains to clarify the conditions of Tredern' s 

 life and work; Baer published the results of his search in a 

 special article. ^ In 1901 the late professor of Dorpat 

 University, Ludwig Steida, who is known for his review of 

 Russian work in histology and embryology, printed the Latin 

 text of Tredern' s dissertation translated from the German. 

 He prefaced this with an introductory article containing a 

 biography of Tredern, which drew additional information, 

 particularly from Baer's papers. 2 in 1927, M. M. Solovev gave 



K. E. v. Baer, "Biographische Nachrichten uber den 

 Embryologen Graf en Ludwig Sebastian Tredern," BULL. 

 ACAD. SCI. ST. PETERSB., 19 (1874), pp. 67 - 76. 

 L. Stieda, "Der Embryologen Graf von Tredern und seine 

 Abhandlung uber das Huhnerei," ANAT . HEFTE. BEIT. U. 

 REFERATE Z. ANAT. U. ENTW. , Part I, Bk. LVTII, 

 Vol. XVIII (1901), pp. 1 - 69. 



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