For some time past, my attention has been directed to the use of anaesthetics in parturition. I had often been requested by patients to administer chloroform to them during labour, but I had seen the ill effects of this drug in one instance so strongly and almost fatally developed, that I shrank from its use. After considerable reflection on the subject, I thought that if a plan could be devised by which the anaesthetic agent should act only in deadening sensation, and not interfere with consciousness, it would be a boon to the accoucheur as well as to the patient. How was this to be effected? Two conditions appeared necessary for its accomplishment,--namely, a modification of the Inhaler at present in use; and certain additions to the chloroform--additions which would reduce its strength, and give it a certain flavour. These two conditions I had not much difficulty in fulfilling. But there arose an obstacle of more serious moment: How, when, and for what time, was the inhalation to be made? I will now give an account, _seriatim_, of my inhaler, the anodyne fluid which I employ, and the mode in which I direct the inhalation to be made. _The Inhaler_[A] is similar to one very commonly used in administering chloroform. It has, however, in addition, two tubes, an inch and a quarter long and a quarter of an inch in diameter, running parallel to the floor of the inhaler. These tubes, being placed above and to the sides of the inspiring valve, admit two small streams of fresh air, which to a great extent are inspired unmixed with the vapour of the anodyne. In the place of the grating there is a curved prong for retaining the sponge under the right tube and opposite the hole in the right side connected with the cup which receives the mixture to be inhaled. The object of this cup is--first, to receive the mixture, and direct it to the centre of the sponge. It has, in the second place, the advantage of helping to keep the Inhaler cool by the patient making use of it to rest her thumb upon when she is inhaling. It will therefore be gathered from this that the patient herself always holds the inhaler. [Footnote A: Manufactured by Messrs. Weiss and Son.] [Illustration: A, cup; B, external opening of tubes; C, internal opening of tubes; D, sponge.]