It is impossible in writing, always to repeat such qualifications and reservations. They must be taken as understood. Take for instance the augment in Greek and Sanskrit. Some scholars have explained it as a negative particle, others as a demonstrative pronoun; others, again, took it as a mere symbol of differentiation. If the last explanation could be established by more general analogies, then, no doubt, we should have here an inflection, that cannot be referred to combination. Again, it would be difficult to say, what independent element was added to the pronoun +sa+, he, in order to make it sâ, she. This, too, may, for all we know, be a case of phonetic symbolism, and, if so, it should be treated on its own merits. The lengthening of the vowel in the subjunctive mood was formerly represented by Professor Curtius as a symbolic expression of hesitation, but he has lately recalled that explanation as untenable. I pointed out that when in Hebrew we meet with such forms as _Piel_ and _Pual_, _Hiphil_ and _Hophal_, we feel tempted to admit formative agencies, different from mere juxtaposition and combination. But before we admit this purely phonetic symbolism, we should bear in mind that the changes of _bruder_, brother, into _brüder_, brethren, of _Ich weiss_, I know, into _wir wissen_, we know, which seem at first sight purely phonetic, have after all been proved to be the indirect result of juxtaposition and combination, so that we ought to be extremely careful and first exhaust every possible rational explanation, before we have recourse to phonetic symbolism as an element in the production of inflection forms. The chief object, however, of my lecture on the “Stratification of Language” was not so much to show that inflection everywhere presupposes combination, and combination juxtaposition, but rather to call attention to a fact that had not been noticed before, viz.: that there is hardly any language, which is not at the same time _isolating_, _combinatory_, and _inflectional_.