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    use , or any , of the above communication , as you may judge proper , but I thought it deserved to be offered to your perusal , by one of your constant readers A , and STEADY UNITARIAN ,

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    posthuma oci&s publici JuHs fiant \ cum illud non potest non esse magno rei literariae , philosophic et religion ^ emolumenW * P . 76 . The twenty-two Propositions are prefaced by an apology , for annexing them to a treatise on a very different

    subject , alleging the connexion of the author ' s Theory , with the Science of Medicine ; and referring to Newton ' s Doctrine of Vibrations , and Locke ou the power of Association . Dr . Hartley then proceeds to describe the progress of his own speculations and his design in this publication .

    " Tantis utique adjumentis et auctoritatibus fretus , olim agressus sum ulterioretn enucteationem sensationum , moiuum et idearum ; tandemque videor mihi ipsi incidisse in aliquam speciem veri . Sentio interea multas subesse dubitandi causas , multaque contra afferri posse . Quocirca

    dfecrevi , harum rerum theoriam quaridam conjecturalem breviter delineare , atque , arreptk hkc occasione , mecLU corum et philosophorum libero examini subjicere ; -ut exinde edocear , quid corrigendum , delendnm , vel denique retinendum fuerit . Proposui autem conjecturas meas , utut rudes et inceitas , sub form& demonstrationum mathematicarum , ed quod hsee forma coinmodissima \ rideatur ad rerum discutiendarum vim et mentem rite assequendam . " f Pp . 73 , 74 .

    * But , above all , iWu > fo » himself should be consulted on the existence and properties of this te . lher , as I am not sure that I have fully ascertained his meaning * . It is to be wished , that any papers on this subject which he uvay have left behind

    himshould appear . It is , indeed , most desirable , that all the posthumous works of that great and excellent man may soon be given to the public . They could not fail greatly to promote the interests of learning , philosophy and religion .

    • f Thus sustained by such aids and authorities , I some time since attempted the development of sensations , motions and ideas j and I seem , to myself , at length to have fallen upon some truth . Yet I perceive many reasons for hesitation , and that much may be said on another side . I have

    therefore determined , briefly to describe a conjectural theory on these subjects ; and to avail myself of this opportunity to bring- it before physicians and philosophers for their free examination . Thence I « nay learn what requires correction , what must he abaudoned , and . what may be retained , Y ^ t I have proposed my co njectore ^ i bow *

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    & |) d l ? n hartley ' s " ConjeetutiB "

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    Clapton * Sit e * July 15 , 18 IS . IT is , probably , as little known to most of your readers as it was , till

    a few days since , to myself , that Dr . Hartley published the first account of his Theory , in Latin , three years before the appearance of his English Work .

    From the SketcJi prefixed to . the Observations , in 1 . 791 s it appears that * ' his work was begun when he was about 25 years of age / ' in 1730 . In 1789 he published the " Evidence for , and against Mrs . Stephens ' s Medi-

    cines , as a Solvent for the Mone ^ a malady from which he was a great sufferer , and to which his death , in the prime of life , has been attributed .

    On the same subject was printed , at Lei / den , in 1741 , * ' De Lithontriptico * St ' Joanna Stephens nuper invent ** , Dissertatio Epislolaris * auctore Davide Hartley / ' To a second edition

    Of the Dissertatio , printed at Bath , 1746 , the ; u : co * mt to which I have referred , 13 annexed under this title : * ' Conjectures quaedam de Sensu , Motu , et Idearum Generation These Conjecture extend through

    fifty-three octavo pages , containing the twenty-two Propositions which now form the first chapter of the Observations ; and with a few exceptions , are literal versions of the Latin , so far as that extends . For the

    enlargements , especially on the four first Propositions , are much shorter than in the English work , though the tenor of the argument is the same . On 2 Ethe )\ ( -Prop . 5 , ) Sir l&aac Newton is mentioned , but without the

    references to the Optics , or the-Letter to Boyle , first published in Boyle ' s Life by Dr . Birch , 1744 , To that short reference Hartley adds , . •' Verum oniuino consuleridus esi ffewtonus ipse de exi $ tenti& et proprietalibus hujusce aetberis , cum adlnodum iticerlus hu » ream , an me \ item

    ejus satis isstn utus fuerim . Optandum est , ut in lucem emittantur , si qua alia de h&c re iii ' scriptis ejus posthumis compareatit : imo optandum f ut summi hujus optimique viri opora omnia

• Citation
  • Monthly Repository (1806-1838) and Unitarian Chronicle (1832-1833), Aug. 2, 1818, page 500, in the Nineteenth-Century Serials Edition (2008; 2018) ncse.ac.uk/periodicals/mruc/issues/vm2-ncseproduct2479/page/28/