
It also has some very helpful photographs to show the reader what these ne'er-do-wells look like:


Sir Cyril researched the subject of criminal behaviour in the young for many years and codified his research into a sociological equivalent of the Periodic Table:

85 years on, it all seems patently ridiculous. However in 1925, Cyril Burt's apparently exhaustive research, backed up with pseudo-scientific tables and photographic evidence, must have seemed pretty impressive.
You only have to look at this lad to know that he's going to be trouble:


It's interesting to see that people were fretting over the same issues nearly a century ago, looking for easy answers to complicated questions.
As for Mr Burt, he went on to become Sir Cyril and was recognised as one of the leading educational psychologists of his day. There is an interesting article about him here.
In the meantime, we should avoid exposing Belgians to an excess of leisure facilities, otherwise all hell might break loose.