I will begin by admitting how slight is my own first-hand knowledge of the three species except for the great one-horned rhinoceros with which I am, or was, fairly familiar during the thirty years that I spent in Bengal and Assam. Although the little two-horned rhinoceros was still said to exist in the Chittagong forests, while I was there at intervals between 1923 and 1930 I never saw even the tracks of this species until I went to Malaya in 1938. Even there, although I got to know its haunts reasonably well, I only caught two fleeting glimpses of the animal itself. As for the third species, the smaller onehorned rhinoceros, I have never even seen its tracks.