And in many ways, the EW is the place where one can see most clearly the work that the hospital performs, in all its positive and negative aspects; the EW is a kind of microcosm for the hospital as a whole. Its growth in recent years has been phenomenal. Its patient load has been increasing steadily at a rate of 10 per cent per year for nearly a decade. It now treats more than 65,000 patients a year. Half of all hospital admissions come through the emergency ward, and many aspects of hospital life are now arranged around that fact: for example, elective admissions in medicine and surgery may have to wait as long as twelve weeks for a free bed, because emergency cases receive priority. If an elective patient has, for example, surgically treatable cancer, the delay may be difficult for everyone to accept.

Yet the trend is clear. The hospital is oriented toward curative treatment of established disease at an advanced or critical stage. Increasingly, the hospital population tends to consist of patients with more and more acute illnesses, until even cancer must accept a somewhat secondary position. And there is no indication that the hospital has fallen into this role passively; on the contrary, this appears to be the logical outcome of many aspects of its evolution.

Massachusetts General Hospital now consists of twenty-one buildings along the banks of the Charles River. Included within this complex are the first structure, the Bulfinch Building, and the most recent, the Gray Building and Jackson Towers, still under construction. All together, the hospital has more than 1,000 beds, and is one of the largest hospitals in the United States.

Invisible is a complex of equal size, consisting of all the buildings that have been erected and then torn down during the last hundred and forty-six years-the isolation wards, the Building for Offensive Diseases, the laboratories and operating rooms that have come and gone as the demands of medical practice and the patterns of disease have shifted.