On his return, Macleod was surprised and expressed doubt about the results. Banting took this as an attack on his integrity. They argued bitterly, but Banting finally accepted Macleod's instruction that further experiments were needed, and he even convinced Macleod to provide better working conditions and to give him and Best a salary. Further experiments were successful and the three started to present their work at meetings. Macleod was a far better orator, and Banting came to believe that he wanted to take all the credit. Their discovery was first published in the February 1922 issue of "The Journal of Laboratory and Clinical Medicine". Macleod declined co-authorship because he considered it Banting's and Best's work. Despite their success, there remained the issue of how to get enough pancreas extract to continue the experiments. Together, the three researchers developed alcohol extraction, which proved to be far more efficient than other methods. This convinced Macleod to divert the whole laboratory to insulin research and to bring in the biochemist James Collip to help with purifying the extract.