The name of _Mayfair_, the very centre of fashion in the West End, reminds us that in this magnificent quarter of London a fair used to be held in May in the time of Charles II. This gives us an idea of how the district must have changed since then. _Farm Street_, in Mayfair, has its name from a farm which was still there in the middle of the eighteenth century. The ground is now taken up by stables and coach-houses. _Half-Moon Street_, another fashionable street running out of Piccadilly, takes its name from a public house which was built on this corner in 1730. These old names give us some idea of what London was like at different times in the past; but another very interesting group of names are those which are being made in the greater London of to-day. One of the commonest words used by Londoners to-day is the _Underground_. If an eighteenth-century Londoner could come back and talk to us to-day he would not know what we meant by this word. For the great system of underground railways to which it refers was only made in the later years of the nineteenth century. The _Twopenny Tube_ was the name of one of the first lines of these underground railways. It was so called because the trains ran through great circular tunnels, like the underground railways which connect all parts of London to-day. It has now become quite a habit of Londoners to talk of going "by Tube" when they mean by any of the underground railways. One of these lines has a very peculiar and rather ugly name. It is called the _Bakerloo Railway_, because it runs from Baker Street to Waterloo. It certainly makes us think that the Londoners of long ago showed much better taste in the names they invented. CHAPTER VI. WORDS MADE BY GREAT WRITERS. As we have seen, languages while they are living are always growing and changing. We have seen how new names have been made as time went on. But many new words besides names are constantly being added to a language; for just as grown-up people use more words than children, and educated people use more words than uneducated or less educated people, so, too, _nations_ use more words as time goes on. Every word must have been used a first time by some one; but of course it is impossible to know who were the makers of most words. Even new words cannot often be traced to their makers. Some one uses a new word, and others pick it up, and it passes into general use, while everybody has forgotten who made it. But one very common way in which people learn to use new words is through reading the books of great writers. Sometimes these writers have made new words which their readers have seen to be very good, and have then begun to use themselves. Sometimes these great writers have made use of words which, though not new, were very rare, and immediately these words have become popular and ordinary words.