structural:summarization
Expertise in writing

To condemn Dreyfus, the writing on the bordereau had to be compared to that of the Captain. There was nobody competent to analyse the writing on the General Staff. Then Major du Paty de Clam entered the scene: an eccentric man who prided himself on being an expert in graphology. On being shown some letters by Dreyfus and the bordereau on 5 October, du Paty concluded immediately who had written the two writings. After a day of additional work he provided a report that, despite some differences, the similarities were sufficient to warrant an investigation. Dreyfus was therefore "the probable author" of the bordereau in the eyes of the General Staff.

General Mercier believed he had the guilty party, but he exaggerated the value of the affair, which took on the status of an affair of state during the week preceding the arrest of Dreyfus. The Minister did consult and inform all the authorities of the State, yet despite prudent counsel and courageous objections expressed by Gabriel Hanotaux in the Council of Ministers he decided to pursue it. Du Paty de Clam was appointed Judicial Police Officer to lead an official investigation.

Meanwhile, several parallel sources of information were opening up, some on the personality of Dreyfus, others to ensure the truth of the identity of the author of the bordereau. The expert Gobert was not convinced and found many differences. He even wrote that "the nature of the writing on the bordereau excludes disguised handwriting". Disappointed, Mercier then called in Alphonse Bertillon, the inventor of forensic anthropometry but no handwriting expert. He was initially no more positive than Gobert but he did not exclude the possibility of its being the writing of Dreyfus. Later, under pressure from the military, he argued that Dreyfus had autocopied it and developed his theory of "autoforgery".