THE JOURNAL OF PHARMACOLOGY. 



'3 



Paul's reaction for biliary coloring 

 matter. If normal urine (or urine con- 

 taining sugar or albumen) is colored with 

 methylviolet, the color remains un- 

 changed ; if, however, the urine contains 

 biliary pigments, the violet color is 

 changed to blood-red. 



Papassyli's reaction for cane sugar. 

 See Reich 's reaction. 



Pavi's solution for estimating glucose. 

 4.158 g. crystallized copper sulphate, 

 20.4 g. Rochelle salts, and 20.4 g. caustic 

 potash are dissolved in water ; 300 ccs. 

 ammonia water (sp. gr. 0.88) are added, 

 and the whole diluted to one litre. 10. o 

 ccs. of this solution represent 0.005 S- g^ u " 

 cose. When all the cupric salt has been 

 reduced to cuprous the solution is color- 

 less. 



Compare Fehling' s solution. 



Pellagri's morphine reaction. Dissolve 

 morphine in concentrated hydrochloric 

 acid, add a few drops of concentrated 

 sulphuric acid and heat on the water- 

 bath. A distinct purple coloration re- 

 sults. Now add some more hydrochloric 

 acid, then sodium bicarbonate to a neu- 

 tral reaction, and, finally, an alcoholic 

 solution of iodine ; the liquid is colored 

 a deep chrome-green. 



Pellet's solution for estimating glucose. 

 68.7 g. copper sulphate, 200 g. sodium 

 chloride, 100 g. anhydrous sodium car- 

 bonate, and 6.87 g. ammonium chloride 

 are dissolved in hot water and diluted 

 with water to 1 litre. 10 ccs. of this 

 solution are reduced by 0.05 g. glucose. 

 Compare Fehling' s solution. 

 Pelouze's test. Same as Moore's test. 

 Penzoldt's test for acetone in the urine. 

 A few crystals of ortho-nitrobenzaldehyde 

 are dissolved in water and added to the 

 distillate from urine, which is then ren- 



dered alkaline with caustic soda. In the 

 presence of acetone the mixture becomes 

 yellow, then green, and, after several 

 mitutes indigo, separates out. 



Penzoldt's test for sugar in the urine, 

 by means of Ehrlich? s reagent. The urine 

 is rendered strongly alkaline, and treated 

 with a solution of diazobenzolsulphonic 

 acid (1:60); at the same timae a control 

 test is made, using normal urine. The 

 latter is colored yellowish-red by the 

 reagent ; diabetic urine soon becomes 

 dark red and opaque. 



Penzoldt's test for naphthalene in 

 urine. If 1 cc. of concentrated sulphuric 

 acid is added to a trace of urine contain- 

 ing naphthalene, the urine floating on 

 top of the acid will be colored dark green. 

 Upon standing, the acid will assume the 

 same color. 



Perenyi's solution for hardening mi- 

 croscopic preparations consists of 4 vol- 

 umes of 10 p. c. nitric acid, 3 vol. of 

 alcohol, and 3 vol. of a 0.5 p. c. solution 

 of chromic acid. 



Perrot's reagent for ethereal oils is a 

 solution of dimethylanilinviolet in glacial 

 acetic acid and dilute alcohol. With 

 many ethers, aldehydes, phenols, etc., 

 this reagent gives characteristic colora- 

 tions, but does not react with fatty oils 

 or hydrocarbons. On this account this 

 reagent can be employed to detect many 

 adulterations of ethereal oils. 



Persoz's solution for distinguishing 

 textile fibres is prepared by shaking a 

 solution of 10 g. zinc chloride in 10 g. 

 water, with 2 g. of zinc oxide. Upon 

 digesting any fabric in this basic zinc 

 chloride solution at 30 — 40 , any silk 

 contained therein is dissolved. 



Pettenkofer's reaction for biliary acids. 

 Upon adding cane sugar and concen- 



