DEPTHS OF THE OCEAN 



Fig. 164.— Titration Apparatus. 



On a shelf there is a large bottle for the silver solution, which can flow through a glass tube into the 



burette ; the latter is provided with cocks for regulating the inflow and the outflow of the solution. 



Fresh water has its greatest density at 4 C, which is taken 

 as unity. Salt water becomes heavier the lower the temper- 



