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ucky cases； for a moment； and then goes on as before。 Attention may be generated but not commanded； and may be generated successfully with everybody； and at all times； if only the proper method is hit upon。 The first and absolute requirement is to have and to show the same interest oneself。 For it is impossible to infect a man with interest when you have no interest to infect with。 There is nothing more deadly or boresome than to see how witnesses are examined sleepily and with tedium； and how the witnesses； similarly infected； similarly answer。 On the other hand； it is delightful to observe the surprising effect of questions asked and heard with interest。 Then the sleepiest witnesses； even dull ones； wake up： the growth of their interest； and hence of their attention； may be followed step by step； they actually increase in knowledge and their statements gain in reliability。 And this simply because they have seen the earnestness of the judge； the importance of the issue； the case； the weighty consequences of making a mistake； the gain in truth through watchfulness and effort； the avoidance of error through attention。 In this way the most useful testimony can be obtained from witnesses who； in the beginning； showed only despairing prospects。
Now； if one is already himself endowed with keen interest and resolved to awaken the same in the witnesses； it is necessary carefully to consider the method of so doing and how much the witness is to be told of what has already been established； or merely been said and received as possibly valuable。 On the one hand it is true that the witness can be roused to attention and to more certain and vigorous responses according to the quantity of detail told him。＇1＇ On the other； caution and other considerations warn against telling an unknown witness； whose trustworthiness is not ascertained； delicate and important matters。 It is especially difficult if the witness is to be told of presuppositions and combinations； or if he is to be shown how the case would alter with his own answer。 The last especially has the effect of suggestion and must occur in particular and in general at those times alone when his statement；
＇1＇ Slaughter： The Fluctuations of Attention。 Am。 Jour。 of Psych。 XII； 313 （1901）。
or some part of it； is apparently of small importance but actually of much。 Often this importance can be made clear to the witness only by showing him that the difference in the effect of his testimony is pointed out to him because when he sees it he will find it worth while to exert himself and to consider carefully his answer。 Any one of us may remember that a witness who was ready with a prompt； and to him an indifferent reply； started thinking and gave an essentially different answer； even contradictory to his first； when the meaning and the effect of what he might say was made clear to him。
How and when the witness is to be told things there is no rule for。 The wise adjustment between saying enough to awaken interest and not too much to cause danger is a very important question of tact。 Only one certain device may be recommendedit is better to be careful with a witness during his preliminary examination and to keep back what is known or suspected； thus the attention and interest of the witness may perhaps be stimulated。 If； however； it is believed that fuller information may increase and intensify the important factors under examination； the witness is to be recalled later； when it is safe； and his testimony is； under the new conditions of interest； to be corrected and rendered more useful。 In this case； too； the key to success lies in increase of effortbut that is true in all departments of law； and the interest of a witness is so important that it is worth the effort。
Topic III。 PHENOMENOLOGY： STUDY OF THE OUTWARD EXPRESSION OF MENTAL STATES。
Section 10。
Phenomenology is in general the science of appearances。 In our usage it is the systematic co…ordination of those outer symptoms occasioned by inner processes； and conversely； the inference from the symptoms to them。 Broadly construed； this may be taken as the study of the habits and whole bearing of any individual。 But essentially only those external manifestations can be considered that refer back to definite psychical conditions； so that our phenomenology may be defined as the semiotic of normal psychology。 This science is legally of immense importance； but has not yet assumed the task of showing how unquestionable inferences may be drawn from an uncounted collection of outward appearances to inner processes。 In addition； observations are not numerous enough； far from accurate enough； and psychological research not advanced enough。 What dangerous mistakes premature use of such things may lead to is evident in the teaching of the Italian positivistic school； which defines itself also as psychopathic semiotic。 But if our phenomenology can only attempt to approximate the establishment of a science of symptoms； it may at least study critically the customary popular inferences from such symptoms and reduce exaggerated theories concerning the value of individual symptoms to a point of explanation and proof。 It might seem that our present task is destructive； but it will be an achievement if we can show the way to later development of this science； and to have examined and set aside the useless material already to hand。
Section II。 （a） General External Conditions。
‘‘Every state of consciousness has its physical correlate；'' says Helmholtz；＇1＇ and this proposition contains the all in all of our problem。 Every mental event must have its corresponding physical event＇2＇ in some form； and is therefore capable of being sensed； or known to be indicated by some trace。 Identical inner states do not； of course； invariably have identical bodily concomitants； neither in all individuals alike； nor in the same individual at different times。 Modern methods of generalization so invariably involve danger and incorrectness that one can not be too cautious in this matter。 If generalization were permissible； psychical events would have to be at least as clear as physical processes； but that is not admissible for many reasons。 First of all； physical concomitants are rarely direct and unmeditated expressions of a psychical instant （e。 g。； clenching a fist in threatening）。 Generally they stand in no causal relation； so that explanations drawn from physiological； anatomical； or even atavistic conditions are only approximate and hypothetical。 In addition； accidental habits and inheritances exercise an influence which； although it does not alter the expression； has a moulding effect that in the course of time does finally so recast a very natural expression as to make it altogether unintelligible。 The phenomena； moreover； are in most cases personal； so that each individual means a new study。 Again the phenomena rarely remain constant； e。 g。： we call a thing habit；
＇1＇ H。 L。 Helmholtz： ber die Weebselwirkungen der Naturkrfte。 Knigsberg 1854。
＇2＇ A。 Lehmann： Die krperliche usserungen psychologischer Zustnde。 Leipsig Pt。 I； 1899。 Pt。 II； 1901。
we say； ‘‘He has the habit of clutching his chin when