602 MEMOIR OF THE LIFE 



manity lectures, but more especially those of Natural His- 

 tory. On the 5th of August, 1837, he was made Doctor of 

 Philosophy; the subject of his inaugural thesis, which has 

 also been published by the booksellers, being a synopsis of the 

 genus Cassia. The year after, he qualified himself as Private 

 Tutor at the Berlin University in the botanical department, 

 and in the first half of 1839, exchanged his situation for 

 a similar one at the University of Bonn, aided by a 

 government allowance, in consequence of which he was 

 obliged, at the same time, after the death of Professor F. 

 Nees von Esenbeck, to perform the duties of his office. 

 During the latter part of his academical course, and after its 

 completion, Vogel turned his attention principally to descrip- 

 tive botany, for which the collections at Berlin, especially of 

 Brazilian plants, furnished rich materials. 



His talents were peculiarly applied to Leguminous plants. 

 As early as the year 1837, four treatises by him appeared in 

 the eleventh volume of this Journal : " De Swartzeis observa- 

 tiones," " Dalbergiearum genera Brasiliensia" " De Casal- 

 pineis Brazilia," and " Synopsis generis Cassia pars altera. 

 In these, several new genera are proposed, numerous new 

 species are briefly but characteristically described, and many 

 already known have received important corrections. In the 

 year 1838, in conjunction with Dr. Schleiden, he published 

 some greater and lesser treatises, which, for the most part, 

 have reference to the same family, in the 19th vol. of 

 the Acta Acad. Nat. Curiosorum, entitled " Contributions to 

 the history of the development of the parts of the flower in the 

 Leguminosce, and on the Albumen, especially of Leguminosa," 

 both accompanied by numerous illustrations; and in the 

 46th of PoggendorPs Annalen der Chemie und Physick, on 

 "Amyloid, a new vegetable substance. 3 ' At the same time 

 appeared, in the 12th volume of Linnsea, a continuation ot 

 his labours on the leguminous plants of South America, 

 namely an Essay on Brazilian Hedysarea. In the year loo , 

 also, he continued his task with his wonted perseverance, 

 and in the 13th volume of Linnaa, we find two treatises 



