For many people the notion of a house call by a doctor is of an era gone by. Yet, last Sunday, I made such a visit to one of my long-time patients named Karl. Karl and Nelly, his wife of nearly sixty years, live in the Bronx and used to schlep by car to my former office in Queens. When I first moved to Manhattan, they continued their schlep from the Bronx by express bus; now they come by access-a-ride (and they never fail to remind me that there is a dentist on the ground floor of their apartment building.)