328 ' Heinrich Rose, 
himself, makes it difficult for one not familiar with his writings 
tigations. We would suggest, in justice to Rose, and as a ineans 
of trac ng in his book the progress of the science, that should 
another edition hes published, it be furnished with references to 
the original sou 
In an early satin on Iron as a Constituent of the Blood, Rose 
pointed out the effect of organic matter in preventing the pre- 
cipitation of the peroxyd of iron and alumina by alkalies, and 
that the property is peculiar to such organic bodies as are de- 
composed by heat; while those which are volatilized by a high 
temperature do not, in general, interfere with the precipitation. 
He called attention to the error which may be introduced into 
analysis by the production of soluble organic matter from the 
action of nitric acid upon the paper of the filters; and showed 
how this property may be made available in such pres ip" op- 
erations as the separation of titanic acid from the oxyd of iron 
The same idea had occurred to Berzelius, who sett it in the 
separation of zircona; it was afterward proposed by Otto as a 
means of separating phosphoric acid from feeble bases, and is 
necrived to him by Rose without the slightest —— to the 
in pesos contain ing bromine or iodine. e  dexsen peel 
of the natural aluminates, and the use of the acid sulphate of 
h in their analysis, were taught by he first showed 
Baieie te them, but was derived from the mortar in which they 
had been pulveri zed. 
In his analysis of the hypophosphite of cobalt, he discovered 
- te me of the oxyd of this metal to combine with a fur- 
indefinite quantity of oxygen by ignition; and he met 
ae difficulty by reducing the oxyd by hydrogen, and determin- 
oe its —— in the metallic state; a proceeding which has 
n universally adopt 
We owe to Rose the use of chlorid of ammonium and of pee 
anid of potassium in the dry way in quantitative analysis, a8 
also that of —— Ape The different behavior of strong 
and feeble bases toward carbonate of baryta, which he had in- 
vestigated and sheet to be one of their distinguishing charac: 
ters, was also made use of to effect their quantitative e separation. 
~ The sins at in general are precipitated; while the stronger 
bases w oe n only a single atom of Oxy re not 
ate of = at the Ee aon 200° 
"Po thst to a ‘oneal _ there are 
