PREPARATION OF THE SALTS OF MANGANESE. 
11 
priate rose color. Remove from the fire, and pour the contents of 
the vessel into a linen strainer stretched over a frame, returning 
the solution as it passes through until perfectly transparent and 
free from sediment. 
Bi-carbonate of soda added to this purified solution, throws down 
a copious precipitate of carbonate of manganese. For use it must 
be well washed with hot water, collected and suspended to drain 
for twenty-four hours, and dried over a water or sand bath ; if the 
latter, care must be taken not to have the temperature too high ; 
it should not exceed that of boiling water, else the product will be 
dark. 
The carbonate when properly prepared is in the form of a heavy 
white powder, insoluble in water but dissolving readily in sulphuric 
acid. 
The syrup of the iodide of manganese may be conveniently pre- 
pared by dissolving 330 grains iodide of potassium, and 264 grains 
tartaric acid, each separately in one and a half fluid ounces of 
water. Mix the solutions, and filter and saturate the resulting 
hydriodic acid with the carbonate of manganese ; again filter, and 
add sufficient simple syrup to make the whole measure f.^vi. 
This syrup contains fifty grains of solid iodide in each fluid 
ounce ; is permanent in composition, and compatible with vege- 
table infusions and syrups, these properties giving it much advan- 
tage over the corresponding preparations of iron. 
The equivalent of iodide of manganese, assuming it to be an an- 
hydrous salt, is 154. Consequently each ounce of the syrup con- 
tains 40| grains of iodine and 9 J of manganese. 
Carbonate of manganese digested in a concentrated solution of 
tartaric acid, is decomposed, and a tartrate is the result. This 
should be well washed to free it from any excess of acid, and dried 
with a gentle heat. It should be perfectly white, insoluble in wa- 
ter, but soluble without residue in concentrated muriatic acid. 
Phosphate of manganese is most readily prepared by adding to a 
solution of the sulphate of manganese, one of alkaline phosphate 
of soda. A solution of phosphate of soda suitable for this purpose 
is cheaply prepared by digesting 51bs. bone black, with 31bs. sul- 
phuric acid, diluted with one gallon of water, for twenty-four hours, 
occasionally stirring the mixture. At the end of this interval, sepa- 
rate the liquid portion, and saturate to excess with bi-carbonate 
