The author of Scientific Murder Investigation has followed, in his new book, the new lines in the study of criminology, with the express purpose of preventing the criminal from committing crimes by making him count the chances before he launches out on a criminal career. All the laboratory methods of crime deduction are discussed, and Mr. May claims that there is always a clue for every crime, and illustrates his point by many tales of crime, told without attempt at sensationalism. Interesting for students of criminology.