Burglars' lanterns vary in size--they are known as "darkeys" in the profession--the better class of lantern now in use being of the police pattern; a trifle bulky, perhaps, but nevertheless being very reliable, seeing that they are similar to those of Government make. The group of lanterns at the museum may have cost anything between fourpence and a shilling each, certainly no more. Their owners invariably carry them away, unless disturbed, when they are left behind as a legacy. The police seldom attach any importance to the finding of a lantern. Yet one or two of them are ingeniously made. Here is one made out of a Bryant and May's match-box. A handle has been put on to the box proper and a space made for the light to come through, so as to be easily covered with the thumb. Such a lantern as this would be used when using a small jemmy. Its companions have a light-hole even smaller still. They are ordinary lanterns with the glass taken out, a piece of tin inserted, and a hole made only just of sufficient size to allow enough light to pick a key-hole. Perhaps, however, the most ingenious of them all is a small bottle containing a tiny piece of phosphorus. Our friend--once the owner of this highly interesting relic--merely had to "shake the bottle," when, lo and behold! he had all the light he needed on that very useful subject for operating upon--the key-hole. [Illustration: A PHOSPHORUS LANTERN.] There is one other method of gaining light. This is by means of a piece of wax candle stuck in a square bit of yellow soap. Perhaps the jemmy is the most popular burglar's tool with which the public are on disagreeably familiar terms. They can supply you with any size at New Scotland Yard. Here you have a pretty little group of eight large "jemmies"--all of which are used for safe-breaking purposes. They are all made of the best steel. This extra long one--it measures 3ft.--is called "The Lord Mayor," whilst its two next sized ones are dubbed "The Alderman" and "Common Councilman." It is a significant fact, which has never been satisfactorily explained, that the members of the fraternity of which we are now treating go to the City for names for their jemmies. Possibly some of them may have uncomfortable recollections of the Mansion House, and thus take revenge on the Lord Mayor and his colleagues by using them--in the shape of jemmies--for burglarious purposes! [Illustration: EIGHT LARGE JEMMIES]