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In India Mr。 H。 Erskine； whilst residing in his official capacity in the Admednugur District in the Bombay Presidency； attended to the expression of the inhabitants； but found much difficulty in arriving at any safe conclusions； owing to their habitual concealment of all emotions in the presence of Europeans。 He also obtained information for me from Mr。 West； the Judge in Canara； and he consulted some intelligent native gentlemen on certain points。 In Calcutta Mr。 J。 Scott； curator of the Botanic Gardens； carefully observed the various tribes of men therein employed during a considerable period； and no one has sent me such full and valuable details。 The habit of accurate observation； gained by his botanical studies； has been brought to bear on our present subject。 For Ceylon I am much indebted to the Rev。 S。 O。 Glenie for answers to some of my queries。
Turning to Africa； I have been unfortunate with respect to the negroes； though Mr。 Winwood Reade aided me as far as lay in his power。 It would have been comparatively easy to have obtained information in regard to the negro slaves in America； but as they have long associated with white men； such observations would have possessed little value。 In the southern parts of the continent Mrs。 Barber observed the Kafirs and Fingoes； and sent me many distinct answers。 Mr。 J。 P。 Mansel Weale also made some observations on the natives； and procured for me a curious document； namely； the opinion； written in English； of Christian Gaika； brother of the Chief Sandilli； on the expressions of his fellow…countrymen。 In the northern regions of Africa Captain Speedy； who long resided with the Abyssinians； answered my queries partly from memory and partly from observations made on the son of King Theodore； who was then under his charge。 Professor and Mrs。 Asa Gray attended to some points in the expressions of the natives； as observed by them whilst ascending the Nile。
On the great American continent Mr。 Bridges； a catechist residing with the Fuegians； answered some few questions about their expression； addressed to him many years ago。 In the northern half of the continent Dr。 Rothrock attended to the expressions of the wild Atnah and Espyox tribes on the Nasse River； in North…Western America。 Mr。 Washington Matthews Assistant…Surgeon in the United States Army； also observed with special care （after having seen my queries； as printed in the ‘Smithsonian Report'） some of the wildest tribes in the Western parts of the United States； namely； the Tetons； Grosventres； Mandans； and Assinaboines； and his answers have proved of the highest value。
Lastly； besides these special sources of information； I have collected some few facts incidentally given in books of travels。
As I shall often have to refer； more especially in the latter part of this volume； to the muscles of the human face； I have had a diagram （fig。 1） copied and reduced from Sir C。 Bell's work； and two others； with more accurate details （figs。 2 and 3）； from Herde's well…known ‘Handbuch der Systematischen Anatomie des Menschen。' The same letters refer to the same muscles in all three figures； but the names are given of only the more important ones to which I shall have to allude。 The facial muscles blend much together； and； as I am informed； hardly appear on a dissected face so distinct as they are here represented。 Some writers consider that these muscles consist of nineteen pairs； with one unpaired；＇20＇ but others make the number much larger； amounting even to fifty…five； according to Moreau。 They are； as is admitted by everyone who has written on the subject； very variable in structure； and Moreau remarks that they are hardly alike in half…a…dozen subjects。＇21＇ They are also variable in function。 Thus the power of uncovering the canine tooth on one side differs much in different persons。 The power of raising the wings of the nostrils is also； according to Dr。 Piderit；＇22＇ variable in a remarkable degree； and other such cases could be given。
＇20＇ Mr。 Partridge in Todd's ‘Cyclopaedia of Anatomy and Physiology；' vol。 ii。 p。 227。
＇21＇ ‘La Physionomie；' par G。 Lavater； tom。 iv。 1820； p。 274。 On the number of the facial muscles； see vol。 iv。 pp。 209…211。
＇22＇ 〃 ‘Mimik und Physiognomik；' 1867； s。 91。
Finally； I must have the pleasure of expressing my obligations to Mr。 Rejlander for the trouble which he has taken in photographing for me various expressions and gestures。 I am also indebted to Herr Kindermann； of Hamburg； for the loan of some excellent negatives of crying infants； and to Dr。 Wallich for a charming one of a smiling girl。 I have already expressed my obligations to Dr。 Duchenne for generously permitting me to have some of his large photographs copied and reduced。 All these photographs have been printed by the Heliotype process； and the accuracy of the copy is thus guaranteed。 These plates are referred to by Roman numerals。
I am also greatly indebted to Mr。 T。 W。 Wood for the extreme pains which he has taken in drawing from life the expressions of various animals。 A distinguished artist； Mr。 Riviere； has had the kindness to give me two drawings of dogsone in a hostile and the other in a humble and caressing frame of mind。 Mr。 A。 May has also given me two similar sketches of dogs。 Mr。 Cooper has taken much care in cutting the blocks。 Some of the photographs and drawings； namely； those by Mr。 May； and those by Mr。 Wolf of the Cynopithecus； were first reproduced by Mr。 Cooper on wood by means of photography； and then engraved： by this means almost complete fidelity is ensured。
CHAPTER I。
GENERAL PRINCIPLES OF EXPRESSION。
The three chief principles statedThe first principleServiceable actions become habitual in association with certain states of the mind； and are performed whether or not of service in each particular case The force of habitInheritanceAssociated habitual movements in man Reflex actionsPassage of habits into reflex actionsAssociated habitual movements in the lower animalsConcluding remarks。
I WILL begin by giving the three Principles； which appear to me to account for most of the expressions and gestures involuntarily used by man and the lower animals； under the influence of various emotions and sensations。＇1＇ I arrived； however； at these three Principles only at the close of my observations。 They will be discussed in the present and two following chapters in a general manner。 Facts observed both with man and the lower animals will here be made use of； but the latter facts are preferable； as less likely to deceive us。 In the fourth and fifth chapters； I will describe the special expressions of some of the lower animals； and in the succeeding chapters those of man。 Everyone will thus be able to judge for himself； how far my three principles throw light on the theory of the subject。 It appears to me that so many expressions are thus explained in a fairly satisfactory manner； that probably all will hereafter be found to come under the same or closely analogous heads。 I need hardly premise that movements or changes in any part of the body； as the wagging of a dog's tail； the drawing back of a horse's ears； the shrugging of a man's shoulders； or the dilatation of th