De Gradibus

{{Short description|9th-century book by Al-Kindi}}

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| author = Al-Kindi

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| title_orig = رسالة في قدر منفعة صناعة الطب

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De Gradibus was an Arabic book published by the Arab physician Al-Kindi (c. 801–873 CE). De gradibus is the Latinized name of the book. An alternative name for the book was Quia Primos.p. 19, [http://www.ishim.net/ishimj/2/03.pdf "Al-Kindi, A Precursor Of The Scientific Revolution"], Plinio Prioreschi, Journal of the International Society for the History of Islamic Medicine 1, #2 (October 2002), pp. 17–19.

In De Gradibus, Al-Kindi attempts to apply mathematics to pharmacology by quantifying the strength of drugs. According to Prioreschi, this was the first attempt at serious quantification in medicine.p. 18, Prioreschi 2002. During the Arabic-Latin translation movement of the 12th century, De Gradibus was translated into Latin by Gerard of Cremona. Al-Kindi's mathematical reasoning was complex and hard to follow; Roger Bacon commented that his method of computing the strength of a drug was extremely difficult to use.