3882. I was instructed by them also in the quality of those ideas, namely, that inasmuch as they speak by the lips, that is, by the extremely various folds of the lips, it is thus perfectly well known to them who are in such speech, as they see the diversities of the foldings and forms in the lips, as also their minutest motions, with the appliances of the tongue, particularly its tip, all which, numerous as they are, concur [to the effect], and which cannot be known to the inhabitants of our earth. They have thence [i.e. from the earth and its objects] formed to themselves ideas, and only while they are thinking do they represent such forms, whether simple or more and more compound, (:which may appear from the speech of words, wherein are such simple and variously compounded forms, according to which the tongue, the palate, the nostrils, the lips, accommodate themselves:); but the forms of the inhabitants of Mars are still more subtle, because their speech is that of the lips, and much fuller than the speech of words. There are artificial forms of this kind [which they use] as often as they present their ideas, and then when they speak they exercise the greatest caution lest there should be [in it] any idea of thought, which they try skillfully to remove, so that it might be a mere representation of such things, without any idea of thought, from which others would immediately understand them.