This is an attempt to depreciate the value of the teaching of psycho-analysis, and to substitute a theory of toxæmia, and especially endocrine disturbances, for the causation of the neuroses. These are factors which Freud and those who follow him have not failed to take into account. They have recognized that they may play a part, but are not willing to accord to them the chief part in the ætiology.

The views put forward are very unconvincing and, on the whole, are not supported by evidence. For instance, what evidence is there for stating that 'the thyroid is the gland of creation', or 'that we can recognize in it the chief determinant of expression', or again that the practice of masturbation is due to a gonal inadequacy which leads the individual to try to reassure himself on his arrival at the stage of maturity that he is better than a child.