_9th._—When she entered my room the headache was violent; she inhaled 12 pints in 60 of air, and before finishing, the headache had disappeared, and she felt better; this occurred on several _though not on all_ occasions, but she continued the use of the gas for ten days only. She was then obliged to be away for a time, and the headaches returned shortly afterwards: relief had been given, but not permanently. Perseverance here _might_ have shown good results, but an opportunity occurring soon afterwards of a residence in the country for some months, I recommended her to take advantage of it; she has recently returned much improved in health, and is following her occupation again. The two following cases are somewhat allied to the last, in being disorders of secretion or excretion, and are examples of that so common complaint in town people, hepatic congestion; the results were exceptionally favourable, and although under ordinary medicines patients generally improve in a satisfactory manner, yet the malady sometimes shows such a disposition to return, that one really scruples about prescribing over and over again rhubarb, magnesia, nux vomica, acids, or blue pill. CASE VIII.—Mrs. B——, æt. 40, mother of a large family, had been subject to bilious attacks for many years, and had several times been under my care. In May 1868 she had pain over hepatic region, depression, nausea, headache, and yellow conjunctivæ; the stools were frequent, loose, and pale; menstruation was profuse, and occurred oftener than normal. She took at first dilute acids with tinct. rhei co. and improved, but relapsed at the end of June, and it was then that I recommended the gas to her; the prominent symptoms being headache, depression, complete loss of appetite, and a constriction about the chest “as if she could not get air enough:” menorrhagia had been going on for two days. _June 23d._—Inhalation of 4 pints in 60: there was not any marked effect. _25th._—6 pints in 60, and before the inhalation was over the headache was relieved, and all that day she felt “lighter” and better, though rather strange; to bed early, and slept and woke without headache, the first time for nearly twelve months, and was nearly free from her shoulder pain. _27th._—Dose repeated with similar good results, and no medicine taken; the diet was regulated as it had been before. To be brief, she took eight inhalations on alternate days, and at the end of that time was well enough to do without treatment: not that she was quite well, but restored to her ordinary health, and the improvement has up to this time continued.