It has hitherto been assumed that the Tone system of the Yoruba language comprised four tones, viz.—a high tone, a middle tone, a low tone, and a so-called compound tone. An examination of the phonetic structure of the language has led to the conclusion that there are other significant tónes which must be understood. The purpose of this article is to explain the Tone system of the language as viewed in the light of recent investigations. The observations and transcriptions are based upon the pronunciation of Mr. A. Baptist, a native Yoruba, to whom I am considerably indebted for his patience and his zealous interest in the subject.