In this chapter, we are introduced to the small intestine, a six-meter-long, 20-foot-wide body of tissue that is home to many different types of cells, including red blood cells and white blood cells. We learn that the cells that live in the intestine are immune cells, and that they fight with each other every day. The white blood cell, however, is not immune to the attack of the campylobacters. The two men discuss the possibility of an invasion of the colony, and the two men decide that they will release the Hostas and give them food and shelter.