This is a practical reference volume for the student or practising physician to aid him in the investigation, diagnosis, and treatment of allergy in children. It is based on procedures used at The Hospital for Sick Children in Toronto, Canada. In this new fourth edition, material has been added and established treatments up-dated. The allergies to which children are subject are discussed in clear, straightforward language, as are the basic principles of atopic disease. There are sections on prophylaxis of allergy, common mistakes in the care of the allergic patient, the optimistic approach to the care of the allergic patient, anaphylaxis in man, and the immunoglobulins. Each section is documented. Four appendices offer various diets and discuss immunological deficiency diseases, beta adrenergic blockade, and the pathophysiology of asthma.