Barrett — The Expansion and the Densities of Liquids. 331 



the densities of liquids, the densities of two liquids, p and p, being 

 inversely as the height of the liquid columns h and //, or 



p h' 



p h ' 



Here, of course, the surrounding water in both A and B is kept at 

 the same temperature. For the determination of the point of maxi- 

 mum density of water the apparatus is extremely useful in labora- 

 tory practice, different pairs of temperatures in A and B, near the 

 point of maximum density, being taken in successive experiments. 



