_History of the case._ The casualty was caused by the bursting of a Yellow Cross shell close to the man when he was riding a restive mule, and his box respirator was momentarily displaced. A fine spray of the liquid must have splashed lightly over his right side, for cutaneous blisters developed on the neck, the cheek, and the forehead on this side only. The right eye showed serious burning with the central white band, while the left eye was only in the state of general red conjunctivitis. With the lowering of the nutrition of the corneal epithelium, secondary infection is liable to take place. In this case an infiltrated corneal ulcer is seen associated with a hypopyon. It is therefore important when there is conjunctival discharge, which indicates secondary infection, that in addition to the use of atropine the conjunctival sac should be cleansed by frequent bland irrigations and by the instillation of antiseptic drops so as to check infection of any corneal ulceration which may develop. Otherwise the infective progress which has led to hypopyon may progress till panophthalmitis supervenes. PLATE NO. XIIA Stage of resolution after severe burning. The vascular injection is passing off, the solid oedema is becoming absorbed, and the corneal epithelium has regained its normal lustre. In this stage the use of atropine should be discontinued. PLATE NO. XIIB Late stage of resolution. The earlier vascular injection above and below the cornea has practically disappeared; the solid white oedema has been absorbed, and the conjunctiva in the palpebral aperture now shows definite injection, often of a bright violet tint. The entire picture has changed, so that the parts which were red in the acute stage are now white and the part which was formerly white is now red. This drawing would illustrate equally well the condition that may follow immediately on a very slight exposure to the irritant gas, when only a slight central band of red injection develops instead of the bloodless state of white oedema that is caused by the more severe burns. At this stage atropine and shades should be abandoned. Astringent drops should be instilled and photophobia combated with cold douching, &c., while fresh air and occupation will help to restore the general health of the individual and mitigate any tendency to neurasthenia. [Illustration: PLATE XII.] PLATE NO. XIIIA Drawing of the cornea in the acute stage of severe burning. This corresponds with Plate No. XIA. The exposed central area shows grey haze and loss of lustre on its stippled surface, which gradually fades off to the bright lustrous normal surface in the part above that has been protected by the eyelid. Injection of the conjunctival vessels is seen only in relation to this upper and less burned area.