tll^NEATf SOCIETY OF LOTTDO". Ixui 



dysentery, he recovered, and regained bis former health and fresh- 

 nesss. At the beginning of May 1 871 it was noticed that he ex- 

 hibited a certain absence of mind and anxiety, and he informed a 

 friend that it had arisen from an attack of vertigo, the effects of 

 which he could not get rid of, and which he thought might be a 

 warning of apoplexy. In the course of the year this discomfort 

 and anxiety had disappeared, and he seemed to be in his usual 

 health ; but on the morning of the 1st of April, 1872, he was 

 found dead in bis bed. 



Yon Mohl may almost be said to have been a self-taught man. 

 At Stuttgart, in his early youth, his studies were to some extent 

 guided by Frolich (the monographer of the GentianecB and Rie- 

 racid), with whom, as well as with Zuccarini, Steinheil, and Amici, 

 he maintained friendly relations until his death. His acquaint- 

 ances, however, were few; he lived a great deal alone, and 

 was never married. Those persons, however, who were on inti- 

 mate terms with him found in him a cheerful and genial compa- 

 nion, deeply learned in the subjects which were the main employ- 

 ment of his life, but besides that, full of information in literature 

 and art, music excepted, for which he had a decided aversion. 



To give anything like a full account of Von Mohl's writings 

 would be (as has been recently observed) to write a history of 

 vegetable physiology. His separate publications, of which a cata- 

 logue has been given in the ' Botanische Zeitung," were ninety in 

 number. He only wrote two " books " (so to speak), viz. his ' Mi- 

 crographie ' (or an introduction to the knowledge and use of the 

 microscope) and the well-known ' Vegetable Cell.' His other 

 writings appeared from time to time as detached papers, some- 

 times published separately, but for the most part in journals and 

 periodicals. Some only of these papers can here be noticed. In 

 1827, when a student at Tiibingen, he first appeared as an author 

 in his essay " On the Structure of Climbing Plants," and a year 

 afterwards he wrote his " Inaugural Dissertation " on the Pores 

 of Cellular Tissue. The latter was the beginning of the series of 

 invaluable publications upon vegetable histology, in which the 

 structure and chemical composition of cell-membrane, the nature 

 of protoplasm, cell-division, and cell-development, were succes- 

 sively discussed and explained. His first contribution to vege- 

 able anatomy was the essay " De Palmarum Structura,' ' published 

 in 1831, and this was soon afterw^ards followed by the communi- 

 cation to the Academy of Munich " On the Structure of the Stem 



