350 



On Chemical Tests. 



[Oct. 



TABLE OF RE-AGENTS. 



1 Ammonia. 



2 ,, carbonate. 



■3 ,, hydrosulphuret. 



4 Copper, metallic. 



5 Galls, tincture. 



6 Iron, metallic. 



7 ,, protosulphate. 



8 Mercury cyanuret. 



9 ,, protonitrate. 

 10 Muriatic acid. 



11 Muriates. 



12 Oxalic acid. 



13 Oxalates. 



14 Potash. 



15 carbonate, 



Cobalt — 1, gives a blue precipitate, added in larger quantity a green 

 precipitate. 2 red precipitate. 3 black precipitate. 14 blue 

 precipitate turning green if allowed to repose, and dirty pale 

 red when boiled. 15 red precipitate which on boiling becomes 

 blue. 17 red precipitate. 20 green precipitate, lurning grey. 

 21 dark reddish brown precipitate. 5 yellowish white pre- 

 cipitate. 



Columbium — 3, produces a chocolate precipitate. 5 orange precipitate. 

 20 olive precipitate. The recently prepared oxide is soluble 

 in tartaric, citric, or oxalic acid. 



Copper— deutoxide of, 1,2, 14, 15 produce a blue precipitate. 14, 15 

 produce if the solution be boiled a dense black precipitate. 

 12, 22 a greenish white precipitate. 20* a reddish brown pre- 

 cipitate. 21 yellowish green precipitate. 3, 25 black pre- 

 cipitate, but if in small quantity a dark brown precipitate. 6 

 produces a precipitate of metallic copper. 27 black preci- 

 pitate. 



Glucina — 1, 2, 3, 14, 15, 22 produce a voluminous precipitate. 12, 20, 

 21, 25 do not produce precipitates. 



Gold— 1, 2, produce yellow precipitates. 8, 15, 17, 21 produce no pre- 

 cipitate. 14 at first no action, afterwards green colour, and 

 small black precipitate. 12 produces a dark greenish black 

 colour. 20 emerald green or greenish black. 9, 25 black 

 precipitates. 3, 27 produce brown precipitates. 26 reddish 

 purple precipitate. 7 dark brown precipitate, but if the so- 

 lution be very dilute only a blue colouring, and afterwards a 

 brown precipitate. 



Iridium — 5, 20 instantly destroy the red colour of the solution. 1, 14, 

 produce yellow precipitates. 



Iron — protoxide, 1, 2, 14, 15 act much alike, viz. producing a. white pre- 

 cipitate changing to green. 17 white. 22 white, changing to 

 green on exposure to the air. 12, 18 yejlow. 20 blue. 22 

 immediate dark blue precipitate. 3 black precipitate. 25 

 no precipitate. 5 black colour. 



