"This subject may be farther illustrated by a reference to some of the animals below us. The worm commonly denominated a grub is but little else than a mass of abdominal matter. It is therefore one of the humblest and grossest of worms. The insect has also a large abdomen, with a very small chest, and a smaller head. Hence, though superior to the grub, it is low in the scale of animal nature. Reptiles and fish are more elevated, because their abdominal viscera preponderate less. But still they do preponderate; and therefore the rank of the animals is humble. In the hog the abdominal viscera are most strongly developed, and hence his standing among quadrupeds is low. The same is true of the bear and the ox, and also of the sheep and the goat, but in an inferior degree. The horse, especially the barb and the racehorse, furnish no bad specimens of the mixed or balanced temperament. When the latter is undergoing preparation for the course, the object of his keeper is to make the thoracic temperament preponderate as much as possible, for the time, in order to increase his vigor and endurance; in the language of the turf, to give him more strength and 'better bottom.' The warhorse approaches the thoracic temperament. In the canine race, more especially in the greyhound, the thoracic viscera hold the ascendency. Hence the muscular power of the dog is greater, and his grade among quadrupeds higher than those of most of the preceding animals. The same is true of the wolf, the panther, and the tiger. In some dogs there is a considerable cerebral development, but it is never large enough to counterbalance the thoracic. Of all animals, the lion affords the most finished specimen of thoracic preponderance. In proportion to his size, his lungs and heart, especially the latter, are immensely large. And his muscular power corresponds to them. The magnitude of his heart is generally considered the cause of his boldness. Hence a very courageous man is said to have a _great_ heart, or to be _lion-hearted_. All this is popular error. The heart is but a muscle; and, in man, has no more connexion with courage than the gastrocnemii muscles; nor, in the lion, than the muscles that move his tail. Courage is exclusively a cerebral attribute, and has its seat in an organ specifically appropriated to it. In none of the inferior animals does the brain preponderate. That preponderance belongs to humanity, and, as already mentioned, indicates its highest grade. Of all the beings below us, some of the ape tribe have the highest cerebral development. And they approach nearest to man in their degree of intellect. This is farther proof that, other things being alike, the brain gives the measure of mental power. I have lately seen a publication, in which it is gravely asserted, that the large orang-outang catches crabs with a stick, and makes a rude basket of osiers to contain them. Notwithstanding the well-known sagacity of that animal, this statement savors strongly of the