ON THE SEASONAL VAEIATIONS OF TEMPERATURE. 



463 



estuaries named above diverge more or less directly. The depth in the 

 estuaries at low tide was usually from 1^ to 4 fathoms, that of the open 

 water about 6 fathoms. The observations extend over the period from 

 May to September in each year, as long a time as it is practicable to live 

 on a yacht in such an exposed situation. 



The following table gives the monthly means observed in the 

 estuaries : — 



Hiffh Tide 



Low Tide 



Ail- 



May . 

 June 

 July . 

 August 

 September 



May. 

 June 

 July . 

 August 

 September 



1886 



May . 

 June 

 September 



1887 



May . 

 July . 

 September 



May . 

 June. 



July . 



August 

 September 



57-9 

 61-7 

 65-5 

 67-7 

 63-2 



52-3 

 62-8 

 66-8 

 62-5 

 591 



54-6 

 590 

 64-9 



49-7 

 69-4 



58'7 



55'1 

 59-6 

 59-4 

 611 

 599 



58-5 

 G2-4 

 66-9 

 67-5 

 62-7 



531 

 64-2 



66-8 

 62-5 

 59'2 



57-0 

 59-3 

 63-5 



520 

 69-7 

 57-5 



54-3 

 59-2 

 60-8 

 62-2 

 60-4 



56-8 

 65-5 

 68-5 

 65-9 

 631 



530 

 62-3 

 63-7 

 63 1 

 606 



60-2 

 57-4 

 61-8 



54-9 

 671 



56-9 



52-9 

 61-7 

 60-9 

 64-4 

 600 



Making allowance for the incomplete data, tbe mean temperatures in 

 the estuaries and open water were as follows : — ■ 



