The Journal of biological chemistry . tive trap is suggested for use with the VanSlyke apparatus for gas analysis. It is needed because of thedifficulty of obtaining correct determinations when an apparatusis newly set up or is taken apart and cleaned. Small bubblesof air held along the sides of the glass or rubber tubing are dis-lodged gradually. Further, there is always the danger ot a leakwhere the rubber tubing is attached to the glass. The principle and design are clear from Fig. 1. The trap con-sists of a tube with a stop-cock parallel to the long axis of theblood pipette and connected t
The Journal of biological chemistry . tive trap is suggested for use with the VanSlyke apparatus for gas analysis. It is needed because of thedifficulty of obtaining correct determinations when an apparatusis newly set up or is taken apart and cleaned. Small bubblesof air held along the sides of the glass or rubber tubing are dis-lodged gradually. Further, there is always the danger ot a leakwhere the rubber tubing is attached to the glass. The principle and design are clear from Fig. 1. The trap con-sists of a tube with a stop-cock parallel to the long axis of theblood pipette and connected to it by an oblique side arm. It issealed to the apparatus at A. Any gas or fluid from the tubingis trapped, D, and can be removed by means of the stop-cock giving directions to the glass blower, specify that B should besharp and in a higher, horizontal plane than C. The trap can be attached to the fine bore apparatus or theconstant volume apparatus and can be used with a mechanicalshaker. 125 126 Trap for Van Slyke Gas Apparatus. Fig. 1. STUDIES m ETHER ANALYSIS.* By T. K. KRUSE. {From the Department of Physiology and Pharmacology, School of Medicine,University of Pittsburgh, Pittsburgh.) (Received for publication, March U , 1923.) A simple and reliable method for the determination of etherin expired air is still needed. Some methods described are labor-ious and some are inaccurate. The method of Kochmann andStrecker (1) seems the most simple. It depends upon the absorp-tion of ether by alcohol and absorption of alcoholic vapors bywater. Such a procedme affects subsequent analysis in view ofthe fact that carbon dioxide is about three times as soluble inalcohol as it is in water (2). The methods of Nicloux (3) andSpenzer (4) were unsuitable for our purpose. Niclouxs methoddepends upon the oxidation of ether in a sulfuric acid-chromatemixture. The method was found inaccurate, an observation alsonoted by Madelung (5) and Kochmann and Strecker (1), Themethod used b
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