Man is a very special and fascinating machine -- unlike a candle, he does not destroy himself in the process of burning energy, and unlike an automobile he burns not only fuel but himself as he works. A contradiction? It would seem...but in this book man the machine is revealed in various elements which explain this. From the days when Mohler discovered synthetic urea and when Beaumont studied the workings of the stomach through an unhealed opening in that organ of St. Martin, a patient, through the work of other men such as Pasteur, a good deal has been learned about man. Here the enzymes, vitamins, fuel, transportation, defense, amino acids, hemoglobin, of the body are discussed in a spasmodic fashion and unimaginative style which may keep the reader from receiving an organized impression of what he has read and fails to get the fullest out of a fascinating subject. Nevertheless, there is a lot of interesting material here for those who are curious about what goes on inside them.