GEOGRAPHICAL BOTANY. 355 



The thermometric observations made by Stchoukine, 

 from 1830-1844 at Irkutsk (1330 English feet above the 

 level of the sea), give (the months being reckoned as 

 lunar) the following average of temperature : 



January . . - 19'9 c. July . . 18'5 c. 



February . . - 13'6 c. August . . + 13'75 c. 



March . . - 3'25 c. September . + 6'75 c. 



April . . + 575 c. October . . 375 c. 



May . . + 12'25 c. November. . 14-25 c. 



June . . + 17'6 c. December . . 19'9 c. 



Mean temp. = + 0'01 c. 



Maximum = + 35 (once in 1843, 39'5 c.) 



Minimum = 35 



Turczaninow's " Flora of the Baikal Regions" (see the 

 Annual Report for 1842) has been continued, and has 

 now reached the end of the Umbelliferae (Bulletin de la 

 Soc. de Moscou, 1843-44). The following families have 

 thus far been treated of: 3 Rhamnese, 94 Leguminosas, 

 69 Rosacese, 5 Onagrariae, 6 Haloragese, 1 of the Cera- 

 tophylleaB, 1 of the Lythrariae, 2 Tamariscinese, 1 of the 

 Portulacese, 8 Crassulaceae, 1 Nitraria, 9 Grossularieae, 19 

 Saxifragese, 48 Umbellifera 3 ,, with the recently separated 

 genera Physolophium (Angelica saxatilis Turcz.) and Czer- 

 ncevia (Conioselinum Czern&via F. M.) Altogether 542 

 Polypetalous plants have now been fully treated of. 



Kittlitz's work contains some very interesting illustra- 

 tions of the characters of the vegetation of Kamtschatka ; 

 his botanical sketches of the countries, which were made 

 during the well-known voyage of the younger Mertens 

 round the world, and described in the text with a perfect 

 comprehension of the physiognomical characteristics, form 

 one of the most valuable contributions to botanical geo- 

 graphy made during the past year (Vierundzwanzig Ve- 

 getation s-Ansichten von Kiistenlandern und Inseln des 

 stillen Oceans, aufgenommen in den Jahren 1827-9 durch 

 F. H. v. Kittlitz. Siegen und Wiesbaden, 1844-5, 4to). 

 As we cannot omit making a full report upon this work, 



