GEOGRAPHICAL BOTANY. 



383 



N. lat., 8200' above the level of the sea, and upon an 

 open, cultivated flat. The climatic values are as follow : 



Mean temperature, 13 1 C. ; Maximum, 20 6 ; Minimum, 5 C. 



In Koolo (4 N. lat.), south of Enarea, on the confines 

 of the pigmy Doco-negro tribes, according to the reports 

 of the natives, the rainy season lasts from May to February 

 with but slight intermission (iii, p. 64). To the north- 

 west of this part, below the 5th degree of north latitude, 

 the country of Susa is situated, high up on the prolon- 

 gation of the Abyssinian mountains, and there, as at 

 Shoa, the rainy season lasts only three months ; but it 

 must be colder there, for the mountains appeared to reach 

 the sky, and were covered with perpetual snow. This is 

 the district in which Bruce supposed the White Nile to 

 arise. 



Hochstetter has described some new Grasses found in 

 Nubia and Abyssinia, from Kotschy and Schimper's 

 herbarium, and after making some critical remarks upon 

 the results obtained by Raffeneau, Endlicher, and himself 

 in this branch of the Flora, proposes the following new 

 African genera (Ratisbon flora, 1844): Chasmanthera, 

 a Menispermaceous plant from Abyssinia; Paulo-Wil- 

 helmia (Dombeyaceae), from Nubia ; also from Abyssinia, 

 the Umbelliferse, Agrochoris, Haplosciadium, and Gymno- 

 sciadium ; Discopodium (Solanacese) ; Hymenostigma, and 



