18 — 



Table 2. 



Amount of evaporation and precipitation for St. Petersburg and 

 two stations in Transcaspia. After Britzke Table 8. 



St. Petersburg (average of 20 years' observations) 



evaporation, mm. 

 precipitation , mm. 



Tashkent (average of 14 years' observations) 



evaporation, mm. 29 

 precipitation, mm. 41 



320 

 470 



1339 

 328 



Sultan Bend S. E. of Merw (average of 2 years' observations) 



evaporation, mm. 35 

 precipitation, mm. 36 



2764 

 176 



SECTION II. THE VEGETATION OF THE 

 TRANSCASPIAN LOWLANDS 



CHAPTER 4 



Earlier Literature. 



The botanical literature on the Transcaspian lowlands is 

 already large. During the first half of last century, Russian 

 naturalists began to examine this country which was up till 

 then, at least as regards natural history, an unknown land, 

 and since then numerous memoirs have been published. 

 Since the Russian occupation of these vast areas, they have 



