"Besides this there is nothing remarkable felt in the connecting substance. I could distinguish no pulsating vessel. The whole of this cord is covered by the skin. It is remarkably strong, and has no great sensibility, for they allow themselves to be pulled by a rope fastened to it, without exhibiting uneasiness. On ship board, one of them sometimes climbed on the capstan of the vessel, the other following as well as he could, without complaining. When I first saw the boys, I expected to see them pull on this cord in different directions, as their attention was attracted by different objects. I soon perceived that this did not happen. The slightest impulse of one to move in any direction is immediately followed by the other; so that they appear to be influenced by the same wish." This harmony in their movements, Dr. Warren thinks, is a habit formed by necessity. His further account of their habits is extremely curious: "They always face in one direction, standing nearly side by side, and are not able, without inconvenience, to face in the opposite direction--so that one is always at the right, and the other at the left. Although not placed exactly in a parallel line, they are able to run and leap with surprising activity. On some occasions a gentleman, in sport, pursued them round the ship, when they came suddenly to the hatchway, which had been inadvertently left open. The least check would have thrown them down the hatchway, and probably killed one, or both, but they leaped over it without difficulty. They differ in intellectual vigour; the perceptions of one are more acute than those of the other, and there is a corresponding coincidence in moral qualities. He who appears most intelligent is somewhat irritable in temper, while the other's disposition is mild."