This book is about a simple, benign experiment, or perhaps we should call it an inquiry, to learn what are the essential ingredients in interspecies … - Jeffrey Masson

It is often said that if slaughterhouses were made of glass, most people would be vegetarians. If the general public knew what went on inside animal experimentation laboratories, they would be abolished. However, the parallel is not exact. Slaughterhouses are invisible because the public wants them that way. Everyone knows what goes on inside them; they simply do not want to be confronted with it. Most people do not know what goes on with animal experimentation. Slaughterhouses allow visits. Laboratories where animal experiments are performed are secretive. Perhaps those who conduct the experiments know they would be stopped if what they do were known even by other scientists. Perhaps they are ashamed.

Cats do not give us too many chances. Abuse a cat's trust twice and you could be history, for cats are much less forgiving than dogs and will often lose their trust in you should you behave badly. A dog gives you infinite slack; not so a cat.

But Eissler also knew how the very people making the complaints and demanding my dismissal for what was, after all, a disagreement about the history of psychoanalysis, were guilty of extraordinary breaches of ethical conduct.