1. To judge from the scarring of' the corneae when the patient was first seen, actual ulceration must have taken place at the time',1918
2. Subjective symptoms appeared four years later,1922
3. Rapid changes in refraction in the " pre-ulcerative " period of those years, (1922-1925) in which degenerative changes presumably took place in the corneae to account for these variations in refraction
4. Anaesthesia of the corneae first noted in 1924 but probably present fince the initial attack. Is anaesthesia always present in delayed gassed corneae ?