THE JOURNAL OF PHARMACOLOGY. 



any fluorides present as calcium fluoride. 

 After heating the incinerated residues 

 with silicic and sulphuric acids, fluorine 

 is identified in the usual manner as sili- 

 cium fluoride. 



« 



Noll's reagent is a solution of sodium 

 hypo-chlorite. 



Nylander's reagent for glucose. 2 g. 

 bismuth subnitrate and 4 g. Rochelle 

 salts are dissolved in 100 g. of an 8 p. c. 

 solution of caustic soda. To 10 p. of the 

 solution to be tested (diabetic urine) add 

 1 p. of reagent, and boil- A darkening 

 of the liquid due to reduction of the 

 bismuth salt indicates glucose. This 

 solution is also known as Almen's solu- 

 tion. 



Obermeier's reaction for indican. The 

 urine is treated with lead acetate, the 

 resulting precipitate filtered out, and the 

 clear filtrate shaken with a )4 P- c. solu- 

 tion of ferric chloride in fuming hydro- 

 chloric acid (sp. gr. 1.19). Upon ex- 

 tracting with chloroform, this is colored 

 blue if indican was present. 



Olivier's test papers for identifying al- 

 bumen and sugar in the urine, are filter 

 papers saturated with well known rea- 

 gents for albumen and sugar. 



Test-papers for albumen : picric and 

 citric acids ; sodium tungstate and citric 

 acid; potassium mercuric iodide and citric 

 acid ; papers separately saturated with 

 potassium ferrocyanide and citric acid. 



Test-papers for sugar : indigo-carmine 

 and sodium carbonate, separate. 



These papers also go by the name of 

 Geissler's test-papers. For particulars 

 see Ph. Centralh., 24, p. 431 ; 25, p. 3. 



Ost's copper solution for estimating 

 sugar, contains 23.5 g. cryst cupric sul- 

 phate, 250.0 g. sodium carbonate, and 



100.0 g. potassium bicarbonate per litre. 

 Compare Soldaini' s solution. 



Otto's reaction for picro toxin. The 

 yellow solution of the alkaloid in con- 

 centrated sulphuric acid shows a reddish- 

 brown color at the zone of contact with 

 a drop of potassium bichromate solution; 

 upon mixing, the solution is colored 

 green. 



Otto's morphine reaction. With a 

 solution of hydrochloric acid, ferric chlor- 

 ide and potassium ferricyanide, morphine 

 solutions yield precipitates of Prussian 

 blue. 



Otto's modification of Fehling's solu- 

 tion (q. v.) is a solution of 1 p. copper 

 sulphate and 3 p. tartaric acid, to which 

 enough caustic soda solution is added to 

 just produce a clear solution. 



Pacini's solutions, Nos. I and II, are 

 preservative solutions for microscopic 

 sections, and have the following compo- 

 sition : 



I. 



Mercuric chloride, x p. 



Sodium chloride, 2 p. 



Glycerin (25 Be), 13 p. 



Water, 113 p. 



II. 



Mercuric chloride, 1 p. 



Acetic acid, 2 p. 



Glycerin (25 Be), 43 p. 



Water, 275 p. 



Pagel's test for phorphorous acid in 

 phosphoric acid. Phosphorous acid, 

 upon warming with mercuric chloride 

 solution, gives a white precipitate of 

 mercurous chloride. 



Panum's test for albumen. Any liquid 

 (as urine) containing albumen yields a 

 coagulum when boiled with a like vol- 

 ume of a saturated solution of sodium 

 sulphate or sodium chloride. 



