56 



Experiments 

 on it with va- 

 rious tesls. 



ALUMINOUS CHALYBEATE SPRING IN I. OF WIGHT, 



1st specimen •••.» 1008*3 



2d specimen 1007*2 



3d specimen ) 006*9 



3022*4 

 which gives a mean specific gravity of* '1007*5 



Sect. III. Preliminary Experiments on the effects of Re- 

 agents. 



A. Paper stained with litmus was distinctly reddened by 

 the water. 



B. Paper stained with Brazil-wood was changed to a 

 deep purple. 



C. When agitated in contact with the air, or repeatedly 

 poured from one vessel into another, the water became tur- 

 bid, and on standing deposited reddish flakes. 



D. On applying heat to a portion of the water just un* 

 corked, and boiling- it quickly t till k. was reduced to one 

 half or even one third of its original bulk, no precipitation 

 whatever took place ; but on continuing the evaporation, a 

 white feathery crystalline substance appeared on the surface 

 of the fluid, and on pushing the process still further, a sa* 

 line matter of a pale yellowish green colour appeared, 

 which continued to increase till the whole was reduced to a 

 dry yellowish mass. These were the phenomena observed 

 with water recently uncorked ; but when, previous to the 

 evaporation, it had been for some time exposed to the air, 

 or when the evaporation was conducted very slowly, an ap~ 

 pearance of reddish flakes was the first circumstance ob- 

 served. 



E. The mineral acids produced no obvious change in 

 the water. 



F. Oxalic acid produced a slight yellowish tinge ; but 

 no immediate precipitation or turbidness. 



G. Oxalate of ammonia, in small quantity, likewise 

 produced a yellow colour, without precipitate : but on ad^- 

 ding more of this test a white precipitate appeared. 



H. Prussiate of potash and infusion of galls produced 

 abundant precipitates, the one blue, and the other black or 

 dark purple; and the colour of these precipitates was much 



paler 



