30 President's Address. 



Geographical Society," and " Contributions to the Flora of 

 the Northern Maritime Coast of Asia Minor." He also 

 published " Some Eemarks on the Plants collected by Dr 

 Thirke on the North Coast of Asia Minor, and on Olympus 

 in Bithynia." 



In 1847 he gave up his chair at Jena and removed with 

 his family to Berlin. Here he formed most intimate 

 friendships with Ehrenberg, Mitscherlich, Heinrich and 

 Gustav Kose, Poggendorf, &c., and in 1846-7 he brought 

 out his work in three volumes, entitled " Wanderings in 

 the East." In 1848, in the " Monthly Journal of the Berlin 

 Geographical Society," he published an article " On the 

 Forests of the Caucasus in relation to the War at present 

 being carried on there," and in the " Botanische Zeitung " for 

 the same year, a paper *' On the so-called Persian Insect 

 Powder," which has an additional interest now since the 

 Pulegium is attracting such attention as an insecticide. 

 In the spring of 1849 Koch was appointed assistant to 

 Link as Director of the Royal Botanical Garden, and in 

 that year began his lectures at the University. From 1848 

 to 1851 he gave a series of papers in the "Linnaea," being 

 " Contributions to a Flora of the East." In 1849, '' Acan- 

 tliopleura, a new genus of UnibelUferce" appeared from his 

 pen in the " Botanische Zeitung " ; while in 1850 he wrote 

 " On Manna, specially that of Hither Asia." In 1851 he 

 published an excellent map of the Caucasian Isthmus, with 

 various scientific notes, geographical, botanical, &c.; and in 

 the same year he furnished to the Berlin Monatschrift a 

 review of the Flora of the Caucasus for illustrating the above 

 mentioned map. In 1852 he accepted the office of Secre- 

 tary to the Horticultural Society of Berlin, and the pros- 

 perity of that Society was in great measure owing to his 

 exertions. He retained this position till 1873, and during 

 the portion of this time up to 1857 he edited the Trans- 

 actions of that Society, and after that period he brought 

 out his own weekly journal. In 1856 he published a 

 paper '* On the District about the River Rian " (the ancient 

 Phasis) in " Peterraann's Mittheilungen." From 1856 he 

 represented German Horticulture at all International 

 Congresses, and was sent as Commissioner of the Prussian 

 G«)vernment to London, Paris, Amsterdam, St Petersburg, 



