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r ; ... ./"ItEVIEW;!. ' " ; :;^- '.--U :^: '¦¦ :: " Still pteased to praiae, yet not afraid to blame."~P|»pis ^ .. ,., . '"'
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Art . I . T-rTt&o Essays : Qnpupon , Sin * gle Vision with TfooEyes $ the other on Dew . A Letter to the Right Hbn . Lloyd ttordKeifiyom ^ Mnd an Accmmt of a Femafeqf the J&hite Race of Mankind , part of whose Skin
resembles that of a -Negro $ with some Observations on the Causes of the Differences * in Colour and Form between the White and Negro Races of Men * By the late William Charles Wells , M . D ., F . R . S . X ., and E .
With a Memoir of his Life , written by Himself . London , Longman and Co . 1818 , 8 vo . pp . 439 . WE must express our regret that the limits of the Monthly Repository forbid or delay our notice of many literary and scientific works
possessing considerable merit . To the volume which forms the subject of this article we have long been desirous of inviting the attention of our readers ; partly because these pages evince no ordinary talent , but chiefly on account of the instruction to be aerived from
the autobiography of the author . The anonymous Editor informs us that the writings of Dr . W . enumerated in the title have been selected for publication , either as the most interesting in themselves , or as affording the best exhibition of his character :
some of them , it will be perceived , are on topics of Natural Philosophy and Natural HistoTy ; while one discusses what may be termed a point of medical jurisprudence , and another treats of a very curious question in physiology . We should hot have complained , had a few of Dr . W . ' s biographical sketches
and memoirs of his friends been substituted for € S the Letter to Lord Kenyon -. " these are dispersed through different volumes of the Gentleman ' s Magazine , and deserve , we think , to be laid before * the world in a form more convenient and accessible . '
Common ' reajiSrs ^ will soort tRro * v aside the Essay Qn Single Fimn / ntid the Experiment * fotoff ^ &bservafions on Several Subjects W Optics , whichare of the nature of ah Appendix to it : the problem is of- very difficult soltition ;
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nor can Dr . tvYsShetirfm und&istd 8 d without a repeated a&tf labbridfte pfcrusal of this Essay , assisted try a iiidw * ledge of the reasonings of file fefcst authors in this department of Natural Philosophy . Concerning ** an object at the concourse of the optic axes , " he says , 45 , 46 ,
m < c — - It is seen single , because its two similar appeararice ^ in regard to' size , shape and colour , ' are seen by botn eyes in one and the same direction , or , if yoii will , in two directions , Which coincide with each other through the whole of their extent . It therefore matters not
whether the distance be truly or falsely estimated ; whether the object be thought to touch our eyes , or to be infinitely remote . And hence we have a reason , which no other theory of visible direction affords , why objects appeared single to the young gentleman mentioned by Mr . Cheselden , immediately after his being couched , and before he could have learned
to judge of distance by sight . " Dr . Hartley examines the circumstances of single and double vision " with reference to tlie doctrine of association : * by Dr . Reid the property is considered as original - , f while Dr . Smith derives it altogether from custom , and Bishop Berkeley maintains a profound silence respecting the difficulty . The student will find his
advantage in consulting these writers on the phoenomena of vision , together with some other authorities cited by Dr . Wells . t His f € Essay on Dew and several Appearances connected with it , " is far morfe popular : this has been very favourably received by our author ' s
learned contemporaries ; § and posterity will ratify their approbation . A fairer example Of the Inductive Method of Philosophy has seldom , if ever , been presented to the world . The important results of a series of nice and most laborious experiments , are here stated
* Obse ^ v . pn Man , P . i . Pr . § & , ' > rn 4 uiry , &c . p . 285 , ( e ' d . 18 T 7 ) . ; t p . -2 . ¦ ' ' ¦* ; ¦ ¦¦ " ¦¦ § A second edition was published in 1815 . f
R ; ... ./"Iteview;!. ' " ; :;^- '.--U :^: '¦¦ :: " Still Pteased To Praiae, Yet Not Afraid To Blame."~P|»Pis ^ .. ,., . '"'
r ; ... . / "ItEVIEW ;! . ' " ; ;^ - ' .--U : ^ : '¦¦ :: " Still pteased to praiae , yet not afraid to blame . "~ P |» pis ^ .. ,., . '"'
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( 297 )
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vol . xv , 2 o
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Citation
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Monthly Repository (1806-1838) and Unitarian Chronicle (1832-1833), May 2, 1820, page 297, in the Nineteenth-Century Serials Edition (2008; 2018) ncse.ac.uk/periodicals/mruc/issues/vm2-ncseproduct2488/page/41/
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