the expression of emotion in man and animals-第6章
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re； but they are as good for our purpose as more important habits。 It is known to everyone how difficult； or even impossible it is； without repeated trials； to move the limbs in certain opposed directions which have never been practised。 Analogous cases occur with sensations； as in the common experiment of rolling a marble beneath the tips of two crossed fingers； when it feels exactly like two marbles。 Everyone protects himself when falling to the ground by extending his arms； and as Professor Alison has remarked； few can resist acting thus； when voluntarily falling on a soft bed。 A man when going out of doors puts on his gloves quite unconsciously； and this may seem an extremely simple operation； but he who has taught a child to put on gloves； knows that this is by no means the case。
＇4＇ See for my authorities； and for various analogous facts； ‘The Variation of Animals and Plants under Domestication；' 1868； vol。 ii。 p。 304。
＇5＇ ‘The Senses and the Intellect；' 2nd edit。 1864； p。 332。 Prof。 Huxley remarks （‘Elementary Lessons in Physiology；' 5th edit。 1872； p。 306）； 〃It may be laid down as a rule； that； if any two mental states be called up together； or in succession； with due frequency and vividness； the subsequent production of the one of them will suffice to call up the other； and that whether we desire it or not。〃
When our minds are much affected； so are the movements of our bodies； but here another principle besides habit； namely the undirected overflow of nerve…force； partially comes into play。 Norfolk； in speaking of Cardinal Wolsey； says
〃Some strange commotion Is in his brain； he bites his lip and starts； Stops on a sudden； looks upon the ground； Then； lays his finger on his temple： straight； Springs out into fast gait； then； stops again； Strikes his breast hard； and anon； he casts His eye against the moon： in most strange postures We have seen him set himself。〃_Hen。 VIII_。； act 3； sc。 2。
A vulgar man often scratches his head when perplexed in mind； and I believe that he acts thus from habit； as if he experienced a slightly uncomfortable bodily sensation； namely； the itching of his head； to which he is particularly liable； and which he thus relieves。 Another man rubs his eyes when perplexed； or gives a little cough when embarrassed； acting in either case as if he felt a slightly uncomfortable sensation in his eyes or windpipe。＇6＇
From the continued use of the eyes； these organs are especially liable to be acted on through association under various states of the mind； although there is manifestly nothing to be seen。 A man； as Gratiolet remarks； who vehemently rejects a proposition； will almost certainly shut his eyes or turn away his face； but if he accepts the proposition； he will nod his head in affirmation and open his eyes widely。 The man acts in this latter case as if he clearly saw the thing； and in the former case as if he did not or would not see it。 I have noticed that persons in describing a horrid sight often shut their eyes momentarily and firmly； or shake their heads； as if not to see or to drive away something disagreeable； and I have caught myself； when thinking in the dark of a horrid spectacle； closing my eyes firmly。 In looking suddenly at any object； or in looking all around； everyone raises his eyebrows； so that the eyes may be quickly and widely opened； and Duchenne remarks that＇7＇ a person in trying to remember something often raises his eyebrows； as if to see it。 A Hindoo gentleman made exactly the same remark to Mr。 Erskine in regard to his countrymen。 I noticed a young lady earnestly trying to recollect a painter's name； and she first looked to one corner of the ceiling and then to the opposite corner； arching the one eyebrow on that side； although； of course； there was nothing to be seen there。
＇6＇ Gratiolet （‘De la Physionomie；' p。 324）； in his discussion on this subject； gives many analogous instances。 See p。 42； on the opening and shutting of the eyes。 Engel is quoted （p。 323） on the changed paces of a man； as his thoughts change。
In most of the foregoing cases； we can understand how the associated movements were acquired through habit； but with some individuals； certain strange gestures or tricks have arisen in association with certain states of the mind； owing to wholly inexplicable causes； and are undoubtedly inherited。 I have elsewhere given one instance from my own observation of an extraordinary and complex gesture； associated with pleasurable feelings； which was transmitted from a father to his daughter； as well as some other analogous facts。＇8＇
＇7＇ ‘Mecanisme de la Physionomie Humaine；' 1862； p。 17。
＇8＇ ‘The Variation of Animals and Plants under Domestication；' vol。 ii。 p。 6。 The inheritance of habitual gestures is so important for us； that I gladly avail myself of Mr。 F。 Galton's permission to give in his own words the following remarkable case：〃The following account of a habit occurring in individuals of three consecutive generations ｛footnote continues：｝ is of peculiar interest； because it occurs only during sound sleep； and therefore cannot be due to imitation； but must be altogether natural。 The particulars are perfectly trustworthy； for I have enquired fully into them； and speak from abundant and independent evidence。 A gentleman of considerable position was found by his wife to have the curious trick； when he lay fast asleep on his back in bed； of raising his right arm slowly in front of his face； up to his forehead； and then dropping it with a jerk； so that the wrist fell heavily on the bridge of his nose。 The trick did not occur every night； but occasionally； and was independent of any ascertained cause。 Sometimes it was repeated incessantly for an hour or more。 The gentleman's nose was prominent； and its bridge often became sore from the blows which it received。 At one time an awkward sore was produced； that was long in healing； on account of the recurrence； night after night； of the blows which first caused it。 His wife had to remove the button from the wrist of his night…gown as it made severe scratches； and some means were attempted of tying his arm。
〃Many years after his death； his son married a lady who had never heard of the family incident。 She； however； observed precisely the same peculiarity in her husband； but his nose； from not being particularly prominent； has never as yet suffered from the blows。 The trick does not occur when he is half…asleep； as； for example； when dozing in his arm…chair； but the moment he is fast asleep it is apt to begin。 It is； as with his father； intermittent； sometimes ceasing for many nights； and sometimes almost incessant during a part of every night。 It is performed； as it was by his father； with his right hand。
〃One of his children； a girl； has inherited the same trick。 She performs it； likewise； with the right hand； but in a slightly modified form； for； after raising the arm； she does not allow the wrist to drop upon the bridge of the nose； but the palm of the half…closed hand falls over and down the nose； striking it rather rapidly。 It is also very intermittent with this child； not occurring for periods of some months； but sometimes occurring almost incessantly。〃 ｛end of long footnote｝
Another curious instance of an odd inherited movement； associated with the wish to obtain an object； will be given in the course of this volume。
There are other actions which are commonly performed under certain circumstances； independently of habit； and which seem to be due to imitation or some sort of sympathy。 Thus persons cutting anything with a pair of scissors may be seen to move their jaws simultaneously with the blades of the scissors。 Children learning to write often twist about their tongues as their fingers move； in a ridiculous fashion。 When a public singer suddenly becomes a little hoarse； many of those present may be heard； as I have been assured by a gentleman on whom I can rely； to clear their throats； but here habit probably comes into play； as we clear our own throats under similar circumstances。 I have also been told that at leaping matches； as the performer makes his spring； many of the spectators； generally men and boys； move their feet； but here again habit probably comes into play； for it is very doubtful whether women would thus act。
_Reflex actions_Reflex actions； in the strict sense of the term； are due to the excitement of a peripheral nerve； which transmits its influence to certain nerve…cells； and these in their turn excite certain muscles or glands into action； and all this may take place without any sensation or consciousness on our part； though often thus accompanied。 As many reflex actions are highly expressive； the subject must here be noticed at some little length。 We shall also see that some of them graduate into； and can hardly be distinguished from actions which have arisen through habit？ Coughing and sneezing are familiar instances of reflex actions。 With infants the first act of respiration is often a sneeze； although this requires the co…ordinated movement of numerous muscles。 Respiration is partly voluntary； but mainly reflex； and is performed in the most natural and best manner without the interference of the will。 A vast number of complex movements are reflex。 As good an instance as can be given is the often…quoted one of a decapitated frog； which cannot of course feel； and cannot consciously perform； any movement。 Yet if a drop of acid be placed on the lower surface of the thigh of a frog in this state； it will rub off the drop with the upper surface of the foot of the same leg。 If this foot be cut off； it cannot thus act。 〃After some fruitless efforts； therefore； it gives up trying in that way； seems restless； as though； says Pfluger； it was seeking some other way； and at last it makes use of the foot of the other leg and succeeds in rubbing off the acid。 Notably we have here not merely contractions of muscles； but combined and harmonized contractions in due sequence for a special purpose。 These are actions that have all the appearance of being guided by intelligence and instigated by will in an animal； the recognized organ of whose intelligence and will has been removed。〃＇10＇
＇9＇ Prof。 Huxley remarks （‘Elementary Physiology；' 5th edit。 p。 305） that reflex actions proper to the spinal cord are NATURAL； but； by the help of the brain； that is through habit； an infinity of ARTIFICIAL reflex actions may be acquired。 Virchow admits （‘Sammlung wissenschaft。 Vortrage；' &c。； 〃Ueber das Ruckeninark；〃 1871； ss。 24； 31） that some reflex actions can hardly be distinguished from instincts； and； of the latter； it may be added； some cannot be distinguished from inherited habits。
We see the difference between reflex and voluntary movements in very young children not being able to perform； as I am informed by Sir Henry Holland； certain acts somewhat analogous to those of sneezing and coughing； namely； in their not being able to blow their noses （i。 e。 to compress the nose and blow violently through the passage）； and in their not being able to clear their throats of phlegm。 They have to learn to perform these acts； yet they are performed by us； when a little older； almost as easily as reflex actions。 Sneezing and coughing； however； can be con
