It is not, therefore, because there are a greater quantity of nervous tufts at the extremity of the fingers than in any other part of the body, that the hand is, in effect, the principal organ of feeling, but merely because it is divided into many parts all moveable, all flexible, all acting at the same time, and are all obedient to the will; and which alone gives us distinct ideas of the figure and form of bodies. Feeling is no more than a contact of superficies, and the superficies of the hand are greater, in proportion, than that of any other part of the human body, because there is not any one which is so greatly divided. This advantage, when added to those derived from the flexibility of the fingers, suffices to render this part the most perfect organ to give us the exact and precise ideas of the form of bodies, and, if the hand had twenty fingers, it is not to be doubted but that the sense of feeling would be infinitely more perfect; and if we should suppose that it were divided into an infinity of parts we should have, even in the very moment of the touch, exact and precise ideas of the figure and difference of bodies, however small. If, on the contrary, the hand were without fingers, we should have but very imperfect and confused knowledge of the objects which surround us. Animals which have hands appear to be the most acute; apes do things so resembling the mechanical actions of man that they seem to be actuated by the same sensations; but those animals which are deprived of hands having not any part divided and flexible enough to be able to twist round the superficies of bodies, they cannot have any precise notion either of the form or size of them. It is for this reason that we often see them frightened at objects which they ought to be the best acquainted with. The principal organ of their feeling is the muzzle, because it is divided in two parts by the mouth, and because the tongue serves them for touching bodies, and turning them, which they do over and over again, before they take them between their teeth. It may also be conjectured, that animals, which, as the scuttle-fish, the polypus, and many insects, have a great number of arms or paws, which they can unite and join, may also have an advantage over others, in knowing how to chuse what is most agreeable to them. Fishes, therefore, whose bodies are covered with scales, ought to be the most stupid of all animals, for they cannot have any knowledge of the form of bodies; and their sense of feeling must be very obtuse, since they cannot feel but through the scales. Thus all animals, whose bodies have no divided extremities, as arms, legs, paws, &c. will have much less sense of feeling than others. Serpents, however, are less stupid than fishes, because, although they have no extremities, and are covered with a hard and scaly coat, they have the faculty of bending round foreign bodies, and by that means obtaining some conception of their form and magnitude.