. Anaesthetics : their uses and administration. its thevapour to enter the larynx, or else holding the catheter in themouth. When a preliminary tracheotomy has to be performedand a Trendelenburgs or Hahns tube is used, the cathetermay be held over the external opening of the tube andchloroform vapour so allowed to enter the trachea. Thealternative plan of using Criles tubes is described above. CHLOROFORM. 259 Another plan is to connect the tube with the gag (Hewitt)and pump the vapour through this tube into the mouth. Junkers inhaler has been modified by Messrs. Krohne andSesemann, the origina
. Anaesthetics : their uses and administration. its thevapour to enter the larynx, or else holding the catheter in themouth. When a preliminary tracheotomy has to be performedand a Trendelenburgs or Hahns tube is used, the cathetermay be held over the external opening of the tube andchloroform vapour so allowed to enter the trachea. Thealternative plan of using Criles tubes is described above. CHLOROFORM. 259 Another plan is to connect the tube with the gag (Hewitt)and pump the vapour through this tube into the mouth. Junkers inhaler has been modified by Messrs. Krohne andSesemann, the original makers (fig. 65). The bottle andtube remain the same, but the face-piece is replaced by aSkinners mask (see fig. 66) so constructed that the chloro-form vapour escapes by a series of holes in the midrib of theframe as in the authors face-piece. The frame is covered bya removable flannel cap. By this contrivance the face-pieceis pervaded with vapour instead of a puff of chloroform beingintermittently propelled against the face. The advantages. Fig. 65.—Krohne and Sesemanns feather respiration register. of the flannel cap are (i) its permitting free breathingthrough its substance, (ii) the patient obtains a free airsupply, and further, the administrator can, by placing hishand over the mask, feel whether or not a sufficient blastof air is being expired. It is cleanly, as it can be removedeasily and washed. The feather seen in fig. 65 at B is intended as a guide tothe administrator, its movements being a register of theexpirations and inspirations of the patient. I think it is notwise to trust to any mechanical test of respiration, howeveringenious ; I therefore prefer to use either the glass maskor flannel cap. Mr. Krohne has further elaborated the 26o ANAESTHETICS. apparatus so as to permit great dilution of the with the most recent pattern of the inhaler iri i can begiven and the dose gradually increased. This is effected inthe following way. The afferent or air
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