Since it is the purpose of this meeting to discuss the problem of improving radiologic departments, it seems fitting that I should first set down the factors that in my opinion are necessary for the maintenance of an ideal radiologic service in a hospital. For the sake of completeness it will be assumed that the hospital under consideration is a large one, although the smaller institutions with their limited facilities are probably more in need of help and advice. REQUISITE FACTORS 1. Proper Equipment and Housing. —The selection of apparatus and its arrangement for hospitals of various sizes is no longer a very difficult matter. The excellent articles by Case 1 and Hickey 2 are helpful and the engineers supplied by the manufacturers are always ready to lend assistance. However, a housing for the department designed to preserve the health of the operators and to offer the maximum safety to