548 



BIOLOGY OF THE SEAS OF THE U.S.S.R. 



course of temperature in the Central and Southern Caspian as well as the 

 temperatures in the cross sections, longitudinal along the Sea and transverse 

 ones across the Central and Southern Caspian (Fig. 261a, в, c). 



Fig. 261 . Isotherms of cross sections of the Caspian Sea in (A) winter, and (B) summer 



(Brujevitch, 1937). 



The temperature of the deep waters of the Caspian Sea varies but little and 

 in practice it may be considered constant. Over the last 20 years a difference 

 of only 0-05° has been recorded in the depths of the Sea (according to Bruje- 

 vitch, 1937). 



It had already been established by the work of Knipovitch that there is a 



