When the Sikh war broke out Burton resigned his post under Scott in order to take part in the campaign in the Punjab, but peace being proclaimed a few weeks later, after the battle of Sobraon, Burton had no opportunities of distinguishing himself. So he returned to his studies, and now became ambitious to understand not only the people but also the monkeys of India. Consequently he collected some forty of them, made them live and eat after the manner of humans; and studies them as they mowed and gibbered. He would then talk to them and pronounce the sounds they made, until at last they could conduct quite a conversation together. Burton never divulged this talk, which, of course, may have been of a confidential nature, but he compiled a Simian Dictionary, and thus to some extent anticipated the work of Mr. R. L. Garner. Unfortunately the dictionary was some years later destroyed by fire.