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From the reasons above assigned； namely； the fleeting nature of some expressions （the changes in the features being often extremely slight）； our sympathy being easily aroused when we behold any strong emotion； and our attention thus distracted； our imagination deceiving us； from knowing in a vague manner what to expect； though certainly few of us know what the exact changes in the countenance are； and lastly； even our long familiarity with the subject；from all these causes combined； the observation of Expression is by no means easy； as many persons； whom I have asked to observe certain points； have soon discovered。 Hence it is difficult to determine； with certainty； what are the movements of the features and of the body； which commonly characterize certain states of the mind。 Nevertheless； some of the doubts and difficulties have； as I hope； been cleared away by the observation of infants； of the insane；of the different races of man；of works of art； and lastly； of the facial muscles under the action of galvanism； as effected by Dr。 Duchenne。
But there remains the much greater difficulty of understanding the cause or origin of the several expressions； and of judging whether any theoretical explanation is trustworthy。 Besides； judging as well as we can by our reason； without the aid of any rules； which of two or more explanations is the most satisfactory； or are quite unsatisfactory； I see only one way of testing our conclusions。 This is to observe whether the same principle by which one expression can； as it appears； be explained； is applicable in other allied cases； and especially； whether the same general principles can be applied with satisfactory results； both to man and the lower animals。 This latter method； I am inclined to think； is the most serviceable of all。 The difficulty of judging of the truth of any theoretical explanation； and of testing it by some distinct line of investigation； is the great drawback to that interest which the study seems well fitted to excite。
Finally； with respect to my own observations； I may state that they were commenced in the year 1838； and from that time to the present day； I have occasionally attended to the subject。 At the above date； I was already inclined to believe in the principle of evolution； or of the derivation of species from other and lower forms。 Consequently； when I read Sir C。 Bell's great work； his view； that man had been created with certain muscles specially adapted for the expression of his feelings； struck me as unsatisfactory。 It seemed probable that the habit of expressing our feelings by certain movements； though now rendered innate； had been in some manner gradually acquired。 But to discover how such habits had been acquired was perplexing in no small degree。 The whole subject had to be viewed under a new aspect； and each expression demanded a rational explanation。 This belief led me to attempt the present work； however imperfectly it may have been executed。
I will now give the names of the gentlemen to whom； as I have said； I am deeply indebted for information in regard to the expressions exhibited by various races of man； and I will specify some of the circumstances under which the observations were in each case made。 Owing to the great kindness and powerful influence of Mr。 Wilson； of Hayes Place； Kent； I have received from Australia no less than thirteen sets of answers to my queries。 This has been particularly fortunate； as the Australian aborigines rank amongst the most distinct of all the races of man。 It will be seen that the observations have been chiefly made in the south； in the outlying parts of the colony of Victoria； but some excellent answers have been received from the north。
Mr。 Dyson Lacy has given me in detail some valuable observations； made several hundred miles in the interior of Queensland。 To Mr。 R。 Brough Smyth； of Melbourne； I am much indebted for observations made by himself； and for sending me several of the following letters； namely：From the Rev。 Mr。 Hagenauer； of Lake Wellington； a missionary in Gippsland； Victoria； who has had much experience with the natives。 From Mr。 Samuel Wilson； a landowner； residing at Langerenong； Wimmera； Victoria。 From the Rev。 George Taplin； superintendent of the native Industrial Settlement at Port Macleay。 From Mr。 Archibald G。 Lang； of Coranderik； Victoria； a teacher at a school where aborigines； old and young； are collected from all parts of the colony。 From Mr。 H。 B。 Lane； of Belfast； Victoria； a police magistrate and warden； whose observations； as I am assured； are highly trustworthy。 From Mr。 Templeton Bunnett； of Echuca； whose station is on the borders of the colony of Victoria； and who has thus been able to observe many aborigines who have had little intercourse with white men。 He compared his observations with those made by two other gentlemen long resident in the neighbourhood。 Also from Mr。 J。 Bulmer； a missionary in a remote part of Gippsland； Victoria。
I am also indebted to the distinguished botanist； Dr。 Ferdinand Muller； of Victoria； for some observations made by himself； and for sending me others made by Mrs。 Green； as well as for some of the foregoing letters。
In regard to the Maoris of New Zealand； the Rev。 J。 W。 Stack has answered only a few of my queries； but the answers have been remarkably full； clear； and distinct； with the circumstances recorded under which the observations were made。
The Rajah Brooke has given me some information with respect to the Dyaks of Borneo。
Respecting the Malays； I have been highly successful； for Mr。 F。 Geach （to whom I was introduced by Mr。 Wallace）； during his residence as a mining engineer in the interior of Malacca； observed many natives； who had never before associated with white men。 He wrote me two long letters with admirable and detailed observations on their expression。 He likewise observed the Chinese immigrants in the Malay archipelago。
The well…known naturalist； H。 M。 Consul； Mr。 Swinhoe； also observed for me the Chinese in their native country； and he made inquiries from others whom he could trust。
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