For people who need step by step explanations and accompanied with<br>sketches and anecdotes, this is the booklet to look for.<br><br>It is dated, yes it is. But shown to youngsters some days ago, they all<br>liked it and found it very handy next to their up-to-date textbooks.<br><br>Explaining it does well.  And the text itself is sometimes even humoresqe<br>in its way of describing things. Even for nowadays eyes, it has a value.