Anesthesia . yone would object.* The table shows how many milli-grams of odorous substances, respective-ly, must be contained in one liter of airin order to produce a barely perceptibleolfactory sensation. The list illustratesthe functional capacity of the human ol-factory organ in regard to quantity. Zwaademaker,^ using the olfactom-eter, noticed that in the case of certainodoriferous substances the threshold, orvery first beginning, of perception takeson a high value, under increasing con-centration, after a certain optimum hasbeen reached. With the above facts in mind,Gwathmey employed oil
Anesthesia . yone would object.* The table shows how many milli-grams of odorous substances, respective-ly, must be contained in one liter of airin order to produce a barely perceptibleolfactory sensation. The list illustratesthe functional capacity of the human ol-factory organ in regard to quantity. Zwaademaker,^ using the olfactom-eter, noticed that in the case of certainodoriferous substances the threshold, orvery first beginning, of perception takeson a high value, under increasing con-centration, after a certain optimum hasbeen reached. With the above facts in mind,Gwathmey employed oil of bitter orangepeel in alcoholic solution, first using itby the drop method with ether. Hefound that in this way the odor of etherwas completely masked, not only for thepatient but for the occupants of the operating room as well. The patient passed into the stage of surgicalanesthesia as one dropping into a profound sleep. There was no stageof excitement, the nausea and vomiting being materially reduced. The. Fig. 19.—Tube Withdrawn; Peri-toneal Purse-string Tied;Knot Beneath Aponeurosis.(3) Aponeurosis suture. Figureillustrates practicability of plac-ing skin-stitches while tube re-mains in the abdomen. ^Nussbaum {Rundschau, 1888, 759) found that the odor of chloroform vapormight be masked by means of oil of cloves. In the experiments of the authors,the masking agents tried (terpineol, oil of bergamot, oil of patchouli, oil oflemon, orange, etc.) were superimposed upon water at 37° C, and the anestheticvapor was then passed through. - Passy: Forme periodique du pouvoir odorant dans la serie grasse, Acad. d. Sciences, 1893, 116, 1007. Tigerstedt: Lehrbuch der Physiologie des Menschen, 1902, f, 132. * Eulimen, a pure limonene (density, at 15° C.; boiling point, 175° C),prepared according to a patented process (D. 204, 163), has been proposedas an addition to narcotic mixtures (Riedels Mentor, 1911, 152). ° Zwaademaker, H.: Die Physiologie des Geruc
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