INTERMEDIATE EEAGENTS. 



(i.) GUAM'S SOLUTION. 



Iodine, 1 grm. ; Iodide of Potassium, 2 grins. ; Distilled 

 Water, 300 grms. 



(ii.) ANILINE WATER. 



Distilled "Water, 100 cc. ; Aniline, 5 cc. To be well shaken 

 and the emulsion filtered twice. 



This is the formula generally given, but as the solubility of 

 Aniline is 1 in 27 of Distilled Water, a clear solution of prac- 

 tically the same strength can be obtained by mixing 3 cc. of 

 Aniline with 90 cc. of Distilled Water ; it can also be made 

 extemporaneously by pouring a few drops of Aniline into a 

 test-tube and adding Distilled Water gradually (with agita- 

 tion) until the turbidity disappears. Aniline Water soon 

 spoils, and therefore should be made fresh as required. With 

 the addition of 10 p. c. of Alcohol it keeps much better. 



(iii.) WEAK ACIDULATED WATER. 



Hydrochloric Acid, 1 cc. ; Distilled Water, 1000 cc. 



(iv.) LITHIA WATER. 



Saturated Aqueous solution of Lithium Carbonate (1 in 70), 

 1 cc. ; Water, 30 cc. 



