It was previously shown that chloroform vapour has the effect of suddenly arresting the action of the heart when it is mixed with the respired air to the extent of eight or ten per cent., or upwards; and we must therefore conclude that, in the fatal cases of its inhalation, the air the patients were breathing just before the accidents occurred contained this amount of vapour. There was no means adopted, so far as is reported, to regulate the proportion of vapour in the inspired air, in any case in which an accident happened; and there was the liability in every case that ten per cent. or more of vapour might be present in the air the patient breathed; and in no case did death occur in the manner that it occurs when the vapour of chloroform does not exceed five per cent. of the inspired air. TABLE OF FATAL CASES OF INHALATION OF CHLOROFORM. ───┬────────────┬────┬───────────────┬──────────┬─────────────── No.│ Patient. │Age │ Operation for │ Position │Means by which │ │ in │ which the │ whilst │the chloroform │ │yrs.│chloroform was │inhaling. │was exhibited. │ │ │ inhaled. │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ───┼────────────┼────┼───────────────┼──────────┼─────────────── 1│Girl │ 15 │Removal of │Sitting │Towel │ │ │ toe-nail. │ │ 2│Married lady│ 35 │Extraction of │Sitting │Inhaler │ │ │ teeth. │ │ 3│Patrick │ │Operation for │Lying on │Handkerchief │ Coyle │ │ fistula in │ the side│ │ │ │ ano │ │ 4│Single lady │ 30 │Opening of │Lying │Handkerchief │ │ │ sinus in │ │ │ │ │ thigh │ │ 5│Young woman │ │Amputation of │ │Handkerchief │ │ │ the middle │ │ │ │ │ finger │ │ 6│Young man │ 22 │Transcurrent │ │Inhaler │ │ │ cauterisation│ │ │ │ │ of wrist │ │ 7│Young man │ │Intended │ │Probably │ │ │ removal of │ │ handkerchief │ │ │ toe-nail. │ │ 8│Seaman │ 31 │Removal of │Lying on │Napkin │ │ │ hæmorrhoids │ the side│ 9│Miner │ 17 │Intended │Lying │Handkerchief │ │ │ amputation of│ │ │ │ │ middle finger│ │ 10│Labourer │ 36 │Amputation of │ │Handkerchief │ │ │ toe │ │ │ │ │ │ │ 11│Married lady│ 33 │Intended │Sitting │Handkerchief │ │ │ extraction of│ │