Journal . h N/lO-hydiocliloric acid untU the indicator shows anorange-yellow (not red) colour ; a small quantityof the dry enzyme and three drops of toluene arethen added, the flask is closed, and, after twenty-four hours, the mixtiue Ls titrated with A/IO-hydrochloric acid. Petroleum for medicinal purposes. Brit, and , Oct. 8, 1915. The refined American petroleum oils which haverecently been available as substitutes for liquidparaffin of Russian origin (see this J., 1915, 859),do not always satisfy the requirements of theBritish Pharniacopceia. Many of the Americanproducts have a sp.
Journal . h N/lO-hydiocliloric acid untU the indicator shows anorange-yellow (not red) colour ; a small quantityof the dry enzyme and three drops of toluene arethen added, the flask is closed, and, after twenty-four hours, the mixtiue Ls titrated with A/IO-hydrochloric acid. Petroleum for medicinal purposes. Brit, and , Oct. 8, 1915. The refined American petroleum oils which haverecently been available as substitutes for liquidparaffin of Russian origin (see this J., 1915, 859),do not always satisfy the requirements of theBritish Pharniacopceia. Many of the Americanproducts have a sp. gr. of 0-858, whereas the a product of sp. gr^ not less than 0-860,and moreover they do not satisfy the sulphuricacid test. Gases and liquids ; Apparatus for study of reactions between . E. E. Reid. J. Amer. Chem. Soc, 1915, 37, 2112—2114. TuE apparatus shown in Fig. 1 is suitable for usein the study of catalytic hydrogenations, beinggas-tight for l)oth,increased and reduced pressur& The bearing, AC, is made of two pieces of steelrod, AB and BC, 0-5 and 1-5 ins. long respectively,lioth having J-in. holes drilled longitudinally, thelonger one Ijeing then drilled out to ^j in. fromB to D. The shorter piece is turned for half itslength to fit into the other, forming a double 1072 Cl. XXI.—PHOTOGEAPHIC materials, &c. Cl. XXII.—explosives, &C. [Oct. so, 1915. bearing with an enlarged cavity in the centralportion. When the parts are assembled, channels^ in. square, J and K (Fig. 2). are cut in oppositesides. The nV-in. brass mlet and outlet tubesare laid in these channels, wliich are then filledwith solder, the exc&ss of solder being removedby txirning to make a cylinder which \\ill form atight joint when passed through a cork. TheWitt centrifugal stirrer shown is made of glassand is fastened to the shaft liy a wire ; the is of l-in. drill rod. The bearing passes througha hole in a J-in. rod. EF, and is held in positionby the set screw, G ; the
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
