This little book consists of three lectures giving the author's views on the problems of adolescence, particularly masturbation and homosexuality, and of marriage. As the title suggests, Dr. Crookshank bases his opinions on the teachings of Individual Psychology. He makes frequent comparisons between Adlerian and Freudian theories, expressing his disbelief in the existence of infantile sexuality and of bi-sexuality. Throughout he adopts the teleological approach, a well-worn trail which has been fruitful mainly in misleading investigators. He fails to set forth or analyse adequately the many-sidedness of the problems peculiar to adolescence and marriage, treating them all as only a matter of non-co-operation and lack of courage. In all three lectures there prevails a moralizing atmosphere which is hardly conducive to the scientific treatment of complex psycho-pathological conditions.