23 Analysis of the lately discovered 



Experiment Xll. — One cubic inch of a solution of fresh 

 prepared green sulphate of inn, obtained (according to 

 Davy) by boiling sulphuret of ir<^n ui dikue sulphuric acid, 

 when added to 12 cubic incises of water kept in a corke^ 

 phial, exhibited the following properties : 



1. In 6 hours the mixture acquired an opal colour. 



2. In 12, it was sensibly turbid. 



3. In 24, a coloured precipitate ensued. 



4. In 3f), it became again transparent, having deposited 

 a yellowish brown precipitate. 



Experiment XIII. — 200 grains of fresh prepared white 

 prussiate of iron, (nor dried, but still wet,) on being diffused 

 through 20 cubic inches of water at the fountain head, ac- 

 quired a blue colour after having been kept in a closed phial 

 for 24 hours. Water that had been previously boiled, 

 changed the colour of the white prussiate very slightly. 



Expej-irtieut XIV.-— Silver leaf, gold leaf, and copper leaf, 

 did not lose their lustre on being immeised in the water. 



Experimcr.t XV. — Two grains of nitrate of silver, dissolved 

 in five cubic inches of the water, either fresh from the pump 

 or concentrated by boiling, produced a copious white pre- 

 cipitate, which retained its colour in the dark : the same 

 effect took place with water previously mingled with a fe\v 

 drops of nitric acid. 



Experiment XVI. — Two grains of sulphate of silver oc- 

 casioned a dense cloud in two cubic inches of fresh, or in a 

 like quantify of boiled water : nitric acid did not restore its 

 transparency. 



Experiment XVII. — Five cubic inches of liquid ammonia, 

 added to 15 of water highly concentrated by boiling, effected 

 much turb:dnes3 after suffering the mixture to stand for 24 

 hours. 



Experiment XVTII. — Seven grains of muriate of barvles 

 dropt into six cubic inches of the -a'lne water, produced an 

 abundant precipitate, which was insoluble in muriatic acid : 

 the same effect ensued wiien nitric or muriatic acid had 

 been previously added to the water. 



Experiment XIX. — Ten drops of acetate of barytes rcn- 

 deied two cubic inches of ib.e saline water tut bid. 



Experiment 



