It has contradictions. First they say not to jump to conclusions, then they say that these different types of people will always be this way with no variation.
This book is awash with stereotypes and veiled as being scientific. Supposedly you can analyze people by their body types. All fat people are jolly. Most Jews are fat. Most millionaires are fat. Fat people are the first to line up when restaurants open. I had to stop reading this one, it made me so mad.