XXIX 



Two of his minor works, the f Anatomie des Fischherzens ' and 

 the 'Anatomie und Naturgeschichte des Drachens,' having in the 

 mean time appeared, Tiedemann in 1811 made a journey to the 

 shores of the Adriatic to study the organization of the Echinoderms, 

 a subject which had been proposed for a prize-question by the French 

 Institute. The issue of his labours was his great work on the 

 Holothuria, Asterias, and Echinus, which gained the prize, established 

 his reputation as a Zootomist, and brought him a nomination as Cor- 

 responding Member from the Academies of Paris, Berlin, and 

 Munich. 



The study of the brain in its structure and development, its 

 differences among animals, its characters in different races of man- 

 kind, its defects and deformities was a subject on which Tiedemann 

 bestowed much labour, both mental and manual. In 1813 he pub- 

 lished the f Anatomie der Kopflosen Missgeburten/ and in 1816 his 

 well-known description of the anatomy and development of the Foetal 

 Brain, In this work he described the successive stages of develop- 

 ment of the human brain, and showed the correspondence of these 

 transitory conditions with its permanent conditions in animals lower 

 in the scale ; and notwithstanding the great advances of this as well 

 as other departments of embryology in later times, Tiedemann' s work 

 is still held in high estimation. 



These researches on the brain, so happily begun, were continued 

 through many years of Tiedemann' s life. The breaking up of the 

 Grand-Ducal Menagerie at Carlsruhe afforded him the opportunity 

 of dissecting several rare animals, and of publishing in 1821 the 

 ' Icones Cerebri Simiarum.' In 1825 he gave, in two memoirs pub- 

 lished in the c Zeitschrift fiir die Physiologic/ a comparison of the 

 brains of the Orang Outang and Dolphin with that of Man ; and he 

 has left behind him a large collection of unpublished figures of the 

 brains of animals, which, in the hands of his distinguished son-in-law 

 Prof. Bischoff of Munich, may yet prove serviceable to science. 



The comparison of the brain of the Negro with that of the Euro- 

 pean, to which he next directed his attention, became for Tiedemann 

 a subject of keen interest. After collecting all the materials to which 

 he could find access on the Continent, he made a visit to England in 

 1835, mainly for the purpose of making examinations and measure- 

 ments of the brains and crania of different races to be found in 



