HUGO VON MOHL. 355 



Botanic Garden of St. Petersburg, as assistant to its director, 

 Dr. Fischer, and to the chair of physiology in the Academy of 

 Berne. He accepted the latter in 1832, and occupied it until 

 1835. Then, upon the death of Schubler, he returned to 

 Tubingen, accepted the professorship of botany in its high 

 school, in which chair and in that of Tubingen the rest of 

 his life was passed. Invitations to more prominent and lucra- 

 tive positions, as, for example, to the botanical chair at Berlin 

 University, when vacated by the death of the veteran Link, 

 were unhesitatingly declined. Although he published numer- 

 ous (about ninety) special papers or articles, most of them 

 important and timely, and some of great pith and moment, 

 he resolutely declined to bring out any general work. His 

 " Mikrographie " (1846) and his " Principles of the Anatomy 

 and Physiology of the Vegetable Cell " are his only writings 

 which may claim to be such. The latter, an admirable and 

 still invaluable treatise, appeared as an article in Rudolf 

 Wagner's " Cyclopaedia of Physiology," but is best known to 

 English readers in its separate form, in a translation made by 

 the late Professor Henfrey, with the author's sanction, issued 

 by Van Voorst in 1852. A year or two later it was for a 

 time understood, to the great satisfaction of botanists, that 

 Mohl had agreed to take a prominent part in the production 

 of a general manual of the anatomy and physiology of plants ; 

 but his promise was soon withdrawn. For thirty years he was 

 one of the editors of the " Botanische Zeitung" ; but the edi- 

 torial labor must have devolved mainly upon Schlechtendal 

 and his successor, although occasional articles from Mold's 

 pen appeared as late as the year 1871. During that year 

 his health became seriously impaired ; yet as the new year 

 advanced, apprehension disappeared. Upon Easter Monday 

 he was apparently well, and so retired to nightly rest ; in the 

 morning he was found to have died in sleep. 



