The upper side is slightly convex, rough and tuberculous; the under side is soft and contains all the vital and locomotory organs. Immediately upon being taken from the water the soft under parts seem to shrink away and nothing substantial remains but the upper surface. This is perforated with pores, through which the water enters to all parts of the body by channels. Very near the center is a small opening through which the water is admitted to a strong, rather elastic, tube, which is encircled by a series of rings. Now turn the star fish over and you can see that this tube opens into a ring about the mouth, while similar tubes stretch out to the arms. From these cross tubes little fibers extend, terminating in discs. These are the true organs of locomotion, and are called ambulacra. They move very slowly and are not at all clumsy, but have even been called graceful by some naturalists. A portion of these ambulacra are made fast by suction while the rest of the body is drawn forward; then the first are relaxed and the process repeated, thus they travel in the deep waters. It is quite evident that the five bright red eyes at the tip of each ray are of some use in helping them on their journeys; but just how much they can see is not quite known. When a large object appears before them they prepare to surmount it, often going up very steep sides and down again as easily as though on a level stretch, often standing on the tip of one ray and sometimes on the five, thus resembling a five-legged stool. The heart, situated near the opening on the back, is supplied with a set of blood vessels. They also have respiratory organs and a nervous system, but, judging from the manner they endure vivisection, their nervous system must be of a very low order, for if they are broken in pieces the missing parts will soon grow again—in fact, they do not seem to be disturbed in the least no more than if it were a cast-off garment, and evidently go about as happy with the remaining rays as with the complete body, and, what is still more strange, the broken ray will grow a complete set of arms and a new body. This is one way of reproduction, so if you wish to kill a star fish don’t break it in pieces. The only sure way of making an end to their lives is to drop them in fresh water, when they immediately die. It is very interesting to watch them care for their eggs. These are kept in pouches at the base of the rays, and when emitted through an opening there provided, are actually brooded as a hen her chicks, by arching the central part of the body and bending the rays down, and if the eggs are scattered they take great pains to collect them again, often traveling long distances for them.