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THE JOURNAL OF PHARMACOLOGY. 



trated sulphuric acid to a solution of 

 biliary acids (in the urine), an intense 

 purple coloration is produced. 



Strassburg' s modification. Dissolve 

 some cane sugar in the urine, saturate 

 filter paper with this solution, and after 

 drying, bring the paper in contact with 

 a drop of sulphuric acid. The red color 

 is then to be observed in translucent 

 light. 



DrechseV s modification consists in the 

 use of phosphoric acid (instead of sul- 

 phuric acid) and warming. 



Udransky 's modification. Instead of 

 cane sugar and sulphuric acid, furfurol- 

 sulphuric acid is employed. 



See also Neubauer' s test. 



By reversing the process, Pettenkofer' s 

 reaction can also be employed in testing 

 for sugar; e. g. , in glucosides. See 

 Brunner's reaction for digitalin. 



Piria's ty rosin reaction. The sedi- 

 ment from the suspected urine is warmed 

 with a little concentrated sulphuric acid, 

 diluted, neutralized with calcium car- 

 bonate, and the filtrate treated with ferric 

 chloride solution. If tyrosin was pres- 

 ent, the solution is colored violet. 



According to Piria- Staedeler , the urine 

 sediment is warmed with a little concen- 

 trated sulphuric acid, the solution di- 

 luted, neutralized with barium carbon- 

 ate, boiled, filtered, and added, drop by 

 drop, to a dilute solution of ferric chlo- 

 ride. 



Planta's alkaloid. See Mayer's re- 

 agent. 



Plugge's phenol reaction. A dilute 

 phenol solution is rendered intensely red 

 when boiled with mercuric nitrate solu- 

 tion containing a trace of nitrous acid. 

 At the same time metallic mercury separ- 



ates out, and an odor of salicylol is de- 

 veloped. Compare Frese?iius' phenol 

 reaction. 



Plugge 's reagent yields with albumen 

 a red color similar to the one produced 

 with Mi/Ion's reagent. 



Plugge's reagent for gum ammoniac. 

 30 g. caustic soda are dissolved in water, 

 the solution kept cool during the addi- 

 tion of 20 g. bromine, and then diluted 

 to one liter: A drop of this solution, 

 when added to an aqueous or alcoholic 

 solution of gum ammoniac prepared with 

 the addition of dilute soda lye, immedi- 

 ately causes a rapidly disappearing, 

 beautiful violet color. 



Podwyssotzki's reaction for emetine. 

 With a drop of a saturated solution of 

 sodium phosphouranate, emetine yields 

 a brown coloration which turns to blue 

 upon the addition of a diop of hydro- 

 chloric acid. 



Pollaci's phenol reaction . Phenol turns 

 brown upon treatment with chromic acid 

 mixture. 



Posner's reaction for peptone and al- 

 bumins in urine. After rendering the 

 urine alkaline, it is poured into a test- 

 tude and a layer of very dilute, almost 

 colorless copper sulphate solution care- 

 fully poured on. Peptone causes the 

 formation of a violet zone even in the 

 cold; albumin gives the same reaction 

 upon warming. 



Compare Btiicke's and Rose's biuret 

 reaction. 



Poutet's reaction for fatty oils (elaidin 

 reaction.) Pour 10 g. of oil, 5 g. nitric 

 acid (40 — 42 Be), and 1 g. mercury into 

 a test-tube, dissolve the mercury by 

 shaking for three minutes, allow the 

 mixture to stand 20 minutes, and again 



