Let us recapitulate in thought the immense quantity of motor expressions included in these nine categories and let us note that they have the following characters in common: They are grouped in combinations that are often new and unforeseen; they are not a repetition of daily life, acts necessary for self-preservation. At one time the movements are combined simultaneously (exhibition of beautiful colors), again (and most often) successively (amorous parades, fights, flight, dancing, emission of noises, sounds or songs); but, under one form or another, there is _creation_, _invention_. Here, the imagination acts in its purely motor character; it consists of a small number of images that become translated into actions, and serve as a center for their grouping; perhaps even the image itself is hardly conscious, so that all is limited to a spontaneous production and a collection of motor phenomena. It will doubtless be said that this form of imagination belongs to a very shallow, poor psychology. It cannot be otherwise. It is necessary that imaginative production be found reduced to its simplest expression in animals, and the motor form must be its special characteristic mark. It cannot have any others for the following reasons: incapacity for the work that necessarily precedes abstraction or dissociation, breaking into bits the data of experience, making them raw material for the future construction; lack of images, and especially fewness of possible combinations of images. This last point is proven alike from the data of animal psychology and of comparative anatomy. We know that the nervous elements in the brain serving as connections between sensory regions--whether one conceive of them as centers (Flechsig), or as bundles of commisural fibers (Meynert, Wernicke)--are hardly outlined in the lower mammalia and attain only a mediocre development in the higher forms. By way of corroboration of the foregoing, let us compare the higher animals with young children: this comparison is not based on a few far-fetched analogies, but in a thorough resemblance in nature. Man, during the first years of his life, has a brain but slightly differentiated, especially as regards connections, a very poor supply of images, a very weak capacity for abstraction. His intellectual development is much inferior to that of reflex, instinctive, impulsive, and imitative movements. In consequence of this predominance of the motor system, the simple and imperfect images, in children as in animals, tend to be immediately changed into movements. Even most of their inventions in play are greatly inferior to those enumerated above under nine distinct heads.