The recovery of the lung, even after severe gassing appears to be functionally good. In the earlier stages of convalescence there may still be signs of persisting oxygen want, so that tachycardia with excessively rapid respiration is the result of even slight physical effort. Later these disabilities vanish. The microscopic examination of lungs in these stages of recovery has not been made. [Illustration: PLATE I.] PLATE NO. II Blue type of asphyxia from phosgene poisoning, with intense venous congestion. _History of case._ Drawing made early on second day after gassing; when there was copious frothy sputum, frequent cough, and hurried shallow respiration of 40 to 48 with temperature of 101° and pulse 100. The patient was bled 15 ozs. and oxygen added to the air that he breathed. He soon made a complete recovery. Such venous congestion was more frequent with chlorine poisoning than it now is with phosgene. It is associated with a full strong pulse at the outset, though later the pulse may fail and the asphyxia change to the pallid type shown in Plate III. The patient as a rule is fully conscious and complains chiefly of headache and pains in the chest; he turns restlessly to and fro in extreme general discomfort, and his hurried breathing is interrupted from time to time by short bursts of coughing and of expectoration. The lung is in the oedematous state shown in Plate I. Oxygen, when given by an efficient apparatus, will at once change the blue tint of the face to a full pink colour, showing that it can still be absorbed by the blood through the lungs. Venesection relieves the discomfort felt by the patient, and probably lessens the embarrassment of the circulation. [Illustration: PLATE II.] PLATE NO. III Pallid type of asphyxia from phosgene poisoning, with circulatory failure. The cyanotic hue of the ears and lips, despite the general pallor caused by the failure of the circulation, indicates the intense want of oxygen from which the patient is suffering. Respiratory difficulty is shown in the strained effort of the muscles around the nostrils. _History of case._ Drawing made on second day after gassing, when there was profuse frothy expectoration, hurried shallow breathing of 50 a minute and a rapid running pulse of 132. The patient died two hours later. This pallid or leaden-hued type of asphyxia is characteristically frequent after phosgene, and it may either develop at once with a rapidly progressive failure of the circulation or follow a stage of venous congestion.