The Barnes Foundation in Merion, Pa., a suburb of Philadelphia, contains one of the finest and most extensive collections of impressionist and early modernist painting in the world. The collection was assembled in the first four decades of the century by Dr. Albert C. Barnes, a self-made pharmaceutical millionaire celebrated for his art collection, his art theories and his temper. Until his death in 1951, Barnes carried out well-publicized feuds with numerous institutions and individuals who did not share his tastes or ideas and to whom he addressed his famous, insult-laden letters. Throughout his lifetime, and after his death, one subject of dispute was that of access to his collection. Entry was largely limited to students enrolled at the foundation in courses in art appreciation taught according to the "Barnes Method." Admission to these courses was severely restricted, and Barnes made a special point of refusing access to art critics, art historians, and museum professionals (one art historian, desperate to see the collection, gained admittance by dressing in livery and accompanying Albert Einstein as his chauffeur). A decade after Barnes' death, the foundation was forced to open its doors to the public. It is now open two days and one afternoon a week, to a limited number of visitors.