1570. These are the spirits who constitute the little skin glands, and they are of two kinds, one having sensation, the other without sensation. Those with sensation are the ones who examine on the basis of their own spoken statement whether a matter is so, just as the little glands determine whether elements to which they are exposed are worthy to be admitted. The rest, who are without sensation, are those who affirm, supposing that it is so, thus boldly affirming it.