"I want to have a talk tonight," said Fred, "about the salt we use at our meals. Shall we, Norah?""Oh, that"s just what I wanted," said his sister. "I have been looking at the lump of white salt in the cupboard all the week. I can"t make out where it came from.""Well then," Fred went on, "teacher tells us that, deep down in the earth, there are great solid beds of salt that stretch for many miles.""Yes," Will joined in, "but it is not lean, white salt, like the salt we see. It looks like stone, it is smooth and shiny, and it is brown, not white. Teacher showed us a piece of it. It is called rock-salt, for it is like rock.""Teacher put a piece of this rock-salt in water, and we saw it dissolve, like other salt," said Fred. "I wonder whether Norah forgets the name for water with salt in it.""Oh no," said his sister quickly, "we call it brine.""Well now," said Fred, "teacher asked us to think about the rain. It falls on the ground, but what becomes of it then?
