restrictions now that they can carry oxygen equipment in their pockets or purses. And because portable equipment that can be carried in the doctor's bag is available, physicians can save some lives that would otherwise be lost. Ambulatory oxygen therapy is a recent development (1). The lightweight oxygen containers were devised by Alvan L. Barach, clinical professor of medicine at Columbia University, and are manufactured by Controlled Pressure, Inc., of Erie, Pennsylvania. A pocket or handbag dispenser the approximate size of a cigar, Oxy-Hale, is provided with small, disposable, three-liter oxygen cartridges and a Venturi mouthpiece for administration of oxygen at preset concentration of 32 to 40 percent. Each cartridge provides the patient with oxygen for one to one-and-one-half minutes, and a trained person can change a cartridge in eight seconds. By changing cartridges successively, a person can prolong the administration of oxygen with this device. Thus, a package of 24 extra cylinders supplies 72 liters of oxygen for approximately 24 minutes. After removing the Venturi mouthpiece, a person can attach the Oxy-Hale to a nebulizer for the administration of