One could mention the stative and the passive forms of the verb with their respective prepositional and causative suffixes, each supplying their own series of derivatives; but I fear the reader would weary of them, and the student of African languages has now at his disposal many grammars of Bantu tongues that will fully satisfy his love for comparative language study. My only desire in these few paragraphs is to show that the natives of the Congo do not talk a gibberish like a lot of monkeys, but have at their disposal a magnificent language that excites the admiration of every student. And it will be seen that such complex languages are not to be mastered in a few weeks or months by any globe-trotter who has a fancy for African travel, for they demand time and constant study to appreciate their finesse, and special linguistic ability to master their details and accurately define the words collected, and the various derivatives discovered. It must not be thought that for every verb all the various derivatives can be found, as for obvious reasons some derivatives are not required from some verbs, and other derivatives are not required from other verbs, e.g. the reversive verb _tulola_ = to undo smithing, can be built on _tula_ = to do smithing; but as such an idea as to undo smithing is ridiculous, hence no derivatives founded on the reversive form _tulola_ are to be met with in the language. Smithing can be spoilt, and for that they have a word, but when once a knife is forged it cannot be unforged, i.e. it cannot be returned to iron ore like a knot that can be untied and the string resume its original form.