This thesis is an examination of the extant psychological treatises of Abu Yusuf Yaqub ibn Ishaq al-Kindi, the ninth century A.D. Arab scholar who was among the first of his race to interest himself in strictly philosophical questions. Al-Kindi's writings were among the first fruits of the translation of Greek philosophical and scientific works into Arabic. It is under that aspect that this thesis approaches his views on soul and intellect - as an instance of the passage of Greek philosophical ideas to the Muslim Arabs. Apart from his specifically Islamic position on the nature and value of divine revelation, nearly all of al-Kindi's ideas on psychology can be traced to Greek sources, and the version of that philosophy with which he was directly familiar was that of the late Greek schools. This thesis is an attempt to understand and present al-Kindi's psychology in the light of the Greek sources from which it was derived.

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The present work deals with establishing of the exact meaning of the technical terms used by al-Kindi in the longest of his extant philosophical treatises, The Letter on the First Philosophy. On many occasions, however, when the meaning of a term appeared to be obscure in the Letter, the evidence of al-Kindī's usage of such a term has had to be brought forward from his other philosophical works in order to elucidate its meaning as accurately as possible. / Much attention has been paid to the original significance of the terms that are al-Kindī's translation of Aristotle's philosophical vocabulary. In some instances, when the difference between the Aristotelian usage and that of al-Kindī appeared to be crucial (as for example, in case of the terms ή κοvιή άίσθησις (the common sense), and al-ḥiss al-kullī (the universal sense), both usages have been given in a detailed exposition. / Whenever helpful to clarify the meaning of the terms, the definitions of philosophical terms given by al-Tahānawī in the Ka shshaf, have been included with the definitions proper to al-Kindī. / Most of the philosophical terms have been analyzed in their proper philosophical contexts, which allows not only elucidating more distinctly their meanings but also delineating the main themes of al-Kindī's philosophy.