If the patient lives, his bronchial mucous membrane is slowly regenerated; and during this time he is naturally subject to reflex spasms of coughing or even to a protracted bronchitis. [Illustration: PLATE X.] PLATE NO. XIA Severely burned eye in the acute stage. Early in the second day after exposure to mustard gas vapour the eyelids and the external surface of the globe show an intense inflammatory reaction. Tears stream from between the closed oedematous eyelids, which may even be blistered, and there is often severe pain behind the eyes and in the forehead. The conjunctiva is swollen, oedematous, and bright red from injection of the blood vessels. The injury of the cornea, even when severe, is not so obvious, and careful examination is of great importance for its detection. Photophobia and blepharospasm render examination of the eye very difficult. The majority of gassed eyes exhibit inflammation of a general character that is not illustrated in this Atlas. But examples are continually occurring in which the eye is more severely burned, and these may be recognized by certain characteristic features that are depicted in the drawing, Plate No. XIA. Whenever a dead white band crosses the exposed area of the conjunctiva, while the parts of this membrane covered by the upper and lower lids are red and oedematous, serious injury from the burning is likely to have occurred. In the case illustrated, the caustic effect of the vapour is seen chiefly in the interpalpebral aperture. On each side of the cornea there is a dead white band due to coagulative oedema, which compresses the vessels, impairs the circulation, and thus acts as a menace to the nutrition of the cornea. The swelling in the region of this white band is slight, while the protected conjunctiva above and below it is greatly swollen and injected and may even bulge between the lids. The exposed portion of the cornea is grey and hazy; it has lost its lustre, and when viewed with a bright light and a magnifying glass it shows a blurred ‘window reflex’ and a typical ‘orange-skinned’ surface. The haze gradually fades off above in the region of the protected part of the cornea where the surface is usually bright and smooth. The pupil is at first contracted as the result of irritation and congestion. In this drawing it is shown as artificially dilated by atropine ointment, which should always be used early in severe cases or where there is much pain and blepharospasm. PLATE NO. XIB Slightly later stage of acute burning. The swelling in the conjunctiva above and below has subsided, but the vascular injection remains, and the solid white oedema in the palpebral aperture is still well marked. The cornea is grey in the exposed area. [_For_ History of the case _see page facing Plate XII_. [Illustration: PLATE XI.]