Now further disagreements developed; Burton maintained that they had promised each other in Aden not to make public announcements till they both were back in England and Burton accused Speke of a breach of promise for publicly claiming that the source of the Nile was found on their trip. Burton now turned against the theory that Lake Victoria was the source of the Nile (and now said the river flowing out of the north side of Lake Tanganyika was the source) and thus also reversed himself from the position he took in the letter to Norton Shaw. In that same letter to Shaw, Burton had also stated that Speke would present his findings to the RGS, as he was prevented from traveling because of poor health and would be in England a short time after Speke. Jeal concludes that Burton's claim of a promise from Speke not to go to the RGS was improbable. The jealousies and accusations between the two men got ever greater, further inflamed by their respective circles of friends and people who stood to gain from the feud such as book publishers and newspapers. Burton was still extremely weak, and once he appeared in front of a committee of the RGS he was not able to make a convincing case for his leading a second expedition to settle the outstanding matters about the Nile. The rift widened, and perhaps became irreversible, when Speke was chosen to lead a subsequent expedition instead of Burton. The two presented joint papers concerning the expedition to the Royal Geographical Society on 13 June 1859.
