Research work on texts often needs to rely upon the latest scientific methods to improve its results. When talking about old manuscripts, which make us go far behind, and often exhibit dark zones, the latest software techniques may help. For the scrutiny of one of our manuscripts, an Arabic translation of a now lost Greek Treatise, why not use the NooJ program ?We start by giving the content of the original Treatise. Then, by the analysis of words - their frequency, their spelling – and sentences, we strive to better understand the conditions of the Arabic copy carried out in the 9th Century, in the Middle East, bur only known by copies of the 13th Century performed in Iran.