As a last statement on this question which we put to ourselves, namely, whether pathological liars show the same traits in the laboratory as they do on the witness stand or in general social life, we can answer in the affirmative. We may repeat that others have made as bad records as some of this group, but taking the group as a whole, it is unlike any random 13 cases which might be picked out from our other classes of mentally normal offenders. On the other hand, many a feebleminded testifier has done vastly better than the median of this group. The errors themselves are of the purely inventional type, such as your ordinary report from a mentally normal person does not contain. (There is perhaps one interesting exception to this; Case 3. The report given by this subject included egregious denials of some of the main objects in the picture, and so was fictitious to this extent. She did not say that she did not know whether these to-be-expected objects really were in the picture--she insisted that they were not.) So far as suggestibility is concerned, there are great differences among even normal people in all classes. For comparison with the above group, we may take 63 cases of mentally normal delinquents, all of whom had been offered the full 7 suggestions. The median error of this group was two. Lower than the fraction thus obtained was the result on only 4 of the present cases. We have been interested to see that with some of the pathological liars there is no great suggestibility. The person is willing to deal in his own inventions, but not with false ideas which others attempt to put in his mind. DIAGNOSIS The essentials for the diagnosis of pathological lying are contained in the definition at the beginning of our book. The above considerations of the physical and mental make-up of pathological liars should leave little question as to what belongs in this class. Of course here, as in the study of any mental traits, borderline cases difficult to discriminate will always be found. Sometimes one will not be able to determine whether the individual is a true pathological liar or merely a prevaricator for a normal purpose. We have already stated our inability to determine this in some cases, and yet the nucleus of the type stands out sharply and clearly, and there can be no doubt as to what is practically meant by the definition.