ANNIVERSAET ADDEESS OF THE PRESIDENT. 8l 



from those of Sclater and Wallace. Thus Mr. Thiselton Dyer, in 

 his article on the distribution of plants in the ' Encyclopasdia 

 Britannica,' follows Bentham in recognizing " three tolerably ancient 

 floras," which he divides thus : — 



I. Northern. 



1. Arctic-alpine. 



2. Intermediate or temperate (in Europe, Asia, and N. 



America). 



3. Mediterraneo-Cancasian (countries around the Mediter- 



ranean and part of S.W. Asia, extending east to 

 Sind). 



II. Southern. 



1. Antarctic- alpine. 



2. Australian. 



3. Andine (temperate S. America, Andes, and New 



Zealand). 



4. Mexico-Californian. 



5. South African. 



III. Tropical. 



1. Indo-Malayan (including New Guinea and North 



Australia). 



2. American. 



3. African. 



Another classification is that of Oscar Drude *, who has divided 

 the land-surface of the world into the following fourteen botanical 

 regions or, as he terms them, floral realms (Florenreiche) : — 



1. Northern (northern part of Asia and America, and nearly 



all Europe). 



2. Central Asian (Tibet, Mongolia and Turkestan, and Caspian 



region). 



3. Mediterranean and Orient (countries around Mediterranean, 



Persia, &c., to Indian frontier). 



4. East Asian (China and Japan). 



5. Middle North American (United States chiefly). 



6. Tropical African (Africa S. of the Atlas, the Cape excepted). 



7. East African Islands (Madagascar and Mascarene Archi- 



pelago). 



* Pet. Mitth. ErganzLingsheft, No. 74, 1884, pp. 43, 44. 



