I'm assuming you're referring to the famous book "Kitab al-Kimya'" (The Book of Chemistry) also known as "The Book of the Secret of Secrets" or "Kitab al-Kīmiyā'" in Arabic, attributed to the legendary alchemist Jabir ibn Hayyan (also known as Geber).
(1144 AD) was later translated into modern English. Academic versions are often hosted on platforms like Academia.edu ResearchGate Specialized Excerpts kitab al-kimya english pdf
Though often confused with the alchemical text above due to the similar name, this is a 12th-century masterpiece of Islamic philosophy and ethics Jabir ibn Hayyan - PMC - NIH I'm assuming you're referring to the famous book
: For scholarly analysis and specific translated passages (especially regarding the "Science of Balance"), look for Names, Natures, and Things by Syed Nomanul Haq. Google Books Quick Guide to the Text Book I: Of the Sum of Perfection and
Note: There is no single public-domain, direct "English PDF" of the original Arabic manuscript titled exactly that. The English version available is the Russell translation of the Latin "Geber" corpus.