Ohifuanj Notices. 29 



Empress Augusta, and Koch found her to be a most 

 gracious and friendly protectress. She furnished him with 

 letters of introduction and recommendation to the Czar. 

 Before setting out on his journey, which he did on May 

 4, 1836, he formed an engagement with the daughter of 

 the Professor of Mathematics at Jena — Miss Theresa 

 Weichhart, sixteen years of age. The marriage, which 

 proved a most auspicious union, took place on October 2, 

 1838, after his return from the Caucasus. In his journe}^ 

 he first visited Berlin, where he enjoyed the intimate 

 friendship of Ehrenberg and Alexander von Humboldt, 

 who introduced him to Dubois de Montpereux, who had 

 just returned from the very regions that Koch was about 

 to visit. He then went to St Petersburg, Moscow, &c., 

 and reached Tiflis. Here he was seized with a fever, 

 brought on by a sun-stroke, but here also he formed the 

 friendship of Prince Constantino SuworofF, who tended him 

 during his illness with a brother's care. After Koch's 

 return in 1838 he was appointed Assistant Professor of 

 Botany at Jena, and in 1839 published a work entitled 

 " The Natural System of the Vegetable Kingdom exhibited 

 in the Flora of Jena," In the " Eeport of the German 

 Naturalist Society" for 1840 he published " His Journey to 

 the Caucasus," and " The Plants of the Caucasus ; " while 

 in " Linntea " for 1841-3 there appeared from his pen " A 

 Catalogue of Plants collected in the years 1836-7 in his 

 Journey through the Caucasus, Georgia, and Armenia." 

 He then, in 1842-3, published his journey in the form of a 

 book of much celebrity, under the title of " A Journey 

 across Hussia to the Isthmus of the Caucasus," which was 

 no less valuable for its contributions to geograpliical than 

 to botanical science. Through the influence of Humboldt, 

 Eitter, and Gustav Eose, he was sent by the Berlin 

 Academy of Sciences on his second journey, with George 

 Eosen, the young linguist, as his companion. In May 

 1843 he started for the eastern provinces of Turkey, and 

 again scaled the Caucasus, and brought treasures from 

 regions probably never before visited by a botanist. Near 

 the close of the following year (1844) he returned home, 

 and published in that year " Meteorological Observations 

 taken at Bucharest," in the " Monthly Journal of the Berlin 



