Sometimes what appears as inflection turns out on examination to be merely adjunction. Thus in the Mbaya tongue there are such verbal forms as _daladi_, thou wilt throw, _nilabuite_, he has spun, when the _d_ is the sign of the future, and the _n_ of the perfect. These look like inflections; but in fact _d_, is simply a relic of _quide_, hereafter, later, and _n_ stands in the same relation to _quine_, which means “and also.” To become true formal elements, all such adjuncts must have completely lost their independent signification; because if they retain it, their material content requires qualification and relation just as any other stem word. A few American languages may have reached this stage. In the Mexican there are the terminals _ya_ or _a_ in the imperfect, the augment _o_ in the preterit, and others in the future. In the Tamanaca the present ends in _a_, the preterit in _e_, the future in _c_. “There is nothing in either of these tongues to show that these tense signs have independent meaning, and therefore there is no reason why they should not be classed with those of the Greek and Sanscrit as true inflectional elements.”[24-*] § 13. PSYCHOLOGICAL ORIGIN OF INCORPORATION. This Incorporative plan, which may be considered as distinctive of the American stock of languages, is explained in its psychological origin by Humboldt, as the result of an _exaltation of the imaginative over the intellectual elements of mind_. By this method, the linguistic faculty strives to present to the understanding the whole thought in the most compact form possible, thus to facilitate its comprehension; and this it does, because a thought presented in one word is more vivid and stimulating to the imagination, more individual and picturesque, than when narrated in a number of words.[25-*] But the mistake must not be made of supposing that Incorporation is a _creative act_ of the language-sense, or that its products, the compounds that it builds, are real words. Humboldt was careful to impress this distinction, and calls such incorporated compounds examples of _collocation_ (Zusammensetzung), not of _synthesis_ (Zusammenfassung). On this ground, he doubted, and with justice, the assertion of Duponceau, that the long words of the Lenape (Delaware) dialect are formed by an arbitrary selection of the phonetic parts of a number of words, without reference to the radical syllables.[25-†] He insisted, as is really the case, that in all instances the significant syllable or syllables are retained. § 14. EFFECT OF INCORPORATION ON COMPOUND SENTENCES.