THE following notes are founded on observations on 685 cases of gas poisoning which came under treatment in a casualty clearing station between May 2nd and May 7tl, 1915. The patients were brought in by motor ambulance convoys from the field ambulances-a journey of about ten miles. Some arrived only six lhours after being "gassed," wlhile in other cases a muclh longer period had elapsed before ;they were brought in." Tiley were detained in tlle casualty clearing station only until they were deemed fit to evacuate to the base. The slighter cases were sent down at the earliest possible moment, the mlajority were evacuated within forty-eiglht hours, while a ntumber of severe cases were kept for several days while their condition remained critical. Tlle total number of cases admnitted during this period was 685. They were suffering from all degrees of asplhyxia, but no good reason could be given wlhy some cases were muclh worse than others fromn the same trenclh. It was, however, observed that the older men were almost all severe cases.
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Black et al. (1915) studied this question.