Why we Need Water.~--If we should wet a sponge and lay it away, it would become dry in a few hours, as the water would pass off into the air.

Our bodies are losing water all the time, and we need to drink to keep ourselves from drying up.
~3.~ Water is also very necessary for other purposes.

It softens our food so that we can chew and swallow it, and helps to carry it around in the body after it has been digested, in a way about which we shall learn in future lessons.
~4.~ Still another use for water is to dissolve and wash out of our bodies, through the sweat of the skin, and in other ways, the waste and worn-out particles which are no longer of any use.
~5.

Impure Water.~--Most waters have more or less substances dissolved in them.

Water which has much lime in it is called hard water.