Although introjection is accepted as a constant mechanism in melancholia, in schizophrenia it is frequently masked by a secondary projection. Four case histories are given briefly with a few dreams and associations, shewing the presence of the introjection mechanism in conjunction with schizophrenic symptoms. It is noted that although each case had certain oral erotic features, none of them were characteristic oral erotic personalities. Several suggestions are offered as to the difference in melancholic and schizophrenic mechanisms with reference to introjection.