On the basis of the available materials, biographical 

 data about Tredern can be briefly stated as follows. The 

 family of Tredernov, whose name indicates their Celtic 

 origin, previously lived in Brest. The younger line of 

 this family, to which the embryologist belonged, was named 

 Tredern de Lezerec. The embryologist ! s father, Jean Louis 

 Tredern de Lezerec, was a captain in the French fleet and 

 a mathematician. On September 14, 1780, when Captain 

 J. Tredern was inspector of the naval college in Brest, he 

 became father of a son who received the name Louis Sebastien 

 Marie. The elder Tredern participated in the War of the 

 Vendee on the side of the mutineers and royalists, and after 

 the defeat at the Quiberon peninsula in the summer of 1795 

 he emigrated to Russia with his son Louis Sebastien, who at 

 this time was not yet fifteen years old. Nothing reliable is 

 known about the years of education of the future embryologist 

 in Petersburg. There is reason to assume that he studied in 

 the Petersburg boarding school Abbot Nicollia, where his 

 father apparently was teaching mathematics, and then went 

 into the Navy. In any case, it is known that on October 4, 

 1797, Louis Sebastien Tredern enlisted as a naval cadet in 

 the Russian fleet on the ship "Pimen," which was stationed 

 for a long time in Revel. The young Tredern lived in Revel 

 for four years, information on his presence there existed from 

 individuals who knew him personally and who confirmed the 

 fact that this young man, besides serving in the fleet, had 

 studied and was occupied with investigations in natural 

 history. Thus a certain person named Gamper, from whose father 

 Tredern h ad hired a flat, stated that this remarkable sailor 

 had turned his room into a true open-air cage for birds, which 

 lived there on specially placed saplings. Another person 

 living in Revel, a retired Russian general of Livron, said 

 that he was a neighbor of Tredern f s and frequently helped him 

 to watch dogs, cats, rats, and other animals. 



In the summer of 1801, warrant officer Louis Tredern 

 resigned in order to accompany his ailing father abroad, and 

 both of them left Russia in August. The father returned to 

 France, where he died after some years, and the son involved 

 himself with medicine and the natural sciences in Germany. 

 It is not known in which university he studied. It is known 

 only that in October 1804 Candidate of Science Count 

 Sebastian Tredern was enrolled in Wiirzburg University. In 



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