Within the temperature range permitted it, life now shows many hairbreadth balances. Some marine animals “deactivate” during the winter--the equivalent of that coma and lowered metabolism which is called hibernation in the woodchuck or the chipmunk. If no ice blocks are in the way, and I can walk out over the offshore flats, I find periwinkles still holding on to rocks or driftwood, but obviously slowed down almost to a stop. On the other hand, common rock barnacles breed during the winter months as far north as Delaware and New Jersey, sending out eggs which will hatch in cold sea water into free-swimming larvae. And there is a red crab in Boston Harbor which stays active throughout the winter. When it gets abnormally cold, shellfish “supercool.” They have a freezing nucleus and will survive if not suddenly jarred. Adaptation to ranges in temperature varies enormously. Some plants and animals die when the temperature drops beyond a certain point, and others when they are released too quickly from freezing temperatures. Some animals avoid the cold by migrating, or they are able by specialized habits to eat and survive as permanent residents. The conditions of life in its natural environment, whether land or water, vary from place to place, although the sea, for example, is less extreme and difficult than is the land. Such conditions may show dramatic contrasts in areas that are fairly close together. Because of the influence of the Labrador Current, the waters to the north of Cape Cod are colder than those to the south, where they are influenced by the Gulf Stream. As a result, there are some species of marine invertebrates which exist on one side of the Cape but not the other. The frog, a cold-blooded animal whose tissues approximate the temperature around it, lies in the cold mud, sometimes in blocks of ice, an intrinsic part of winter. The blue jay, on the other hand, is less helpless, and is able to forage above the ice and snow. Like man, it has an internal temperature of its own, regardless of the weather; although man is without the insulation of feathers or fur. A thing apart, I run to my house, my city, the tunnels of my society, in order to escape the cold. I wonder, though, whether this mental animal, a great experiment in complexity, is not as perilously balanced as any simple organism, a mussel or a clam, in the extremes of temperature and environment. _February_ _Secrets in the Open_ Rain comes, heavy, cold, inert. Dirt roads begin to turn to mud. Then the vice tightens again. Below freezing temperatures take hold, putting a new strain on plants and trees lately thawed. It is not steady, continuous cold that now threatens life, but the shifts between freezing and thawing--alternates in the caprices of energy. We are not allowed to open our pores and eyes too much, lest we be taken unawares, stopped as we try to start again.