In our hands here is orientalist Flugel's and Prof. Dr. Ayman Fouad Sayed's Investigations of Al-Nadeem's Index. Looking at both, and in order to have balance between the two publications, we find observations concerning the approach taken by the two investigators in the two investigations, and regarding the manuscripts adopted by each. It is well known that Flugel's investigation of the Index is earlier than Sayed's, yet the problem with the manuscripts of the book he had is that they were incomplete, and that he could not get others better than them according to his own statement. What distinguished him is that he was aware and had alerted the scholars after him to the value of the book, and had left them invaluable observations on the nature of the manuscripts that fell to his hands and were considered inferior, as if he indicated to those after him to remedy this deficiency by searching for copies of the manuscript that are better than the copies he adopted.