Chemistry and Physics. 275 
6. Separation of Manganese from Iron and Nickel ; by Dr. T. 
Scuzn,* St. Louis, Mo.—If a current of chlorine is passed through a 
dilated solution of acetate of manganese, or better, through a mixture 
of chlorid of manganese and acetate of soda, the acetate of manga- 
nese is decomposed after a very short time and all the manganese 
Precipitated as peroxyd, while the acetates of iron and of nickel are 
not affected under similar circumstances. Therefore, if a solution of 
lori anganese nickel and iron contains free hydrochloric 
acid, a sufficient quantity of acetate of soda is added to convert all the 
chlorids into acetates and bind the free hydrochloric acid. The free 
acetic acid thus liberated, does not prevent the formation of peroxyd 
‘Manganese. By this method, cobalt cannot be separated from man- 
» because it is also partly precipitated. 
1. Phosphoric Acid in some of its relations to Physiology and Pa- 
thology ; by D. Breep, M.D., of New York.—Early in 1850, Profes- 
sor Liebig directed my attention to the chemical constitution of the 
us System, as an important and unexplorable field. My first ob- 
Ject was to determine the constituents of the incombustible matter of 
the brain, by burning that organ, and then analyzing the ash. Nearl 
50 per cent. of the ash of an ox’s brain proved to be phosphoric acid, 
Seatch upon the subject of phosphoric acid in urine. After making 
“Fal Dun determinations? of that acid in normal human urine, 
am led to the following conclusions :— oeee 
Ist. A person weighing 150 Ibs., in health, of regular habits, dis- 
charges unifomly about 4,000 grammes (average of 24 days) of phos- 
Phorie acid in 24 hours. . é 
2d. The quantity is greater during the day than during the night, 
| per cent. and per hour. : 
- The amount of water drank in 24 hours does not materially 
alter the quantity of phosphoric acid discharged. ; 
ath. Taking an excess of common salt diminishes the amount of 
Phosphoric acid, while taking potash increases it. : 
¢ eae accompanying statistics derived from experiments which I 
made in the hospitals of Giessen and Ziirich, it will appear that dis- 
The generally very much reduce the amount of phosphoric acid. 
Pi and the patient not much emaciated, gave an extremely smal 
ido! acid, compared with the normal standard: the amount of 
ml Was ine in the cases of epilepsy and apoplexy, and not 
Much din: in 
*h diminished in the case of mollities ossium. 
= B ‘ 
“Madder 32 Oversight in the chemical dictionary of Booth and Morfit, article 
Written gy ol's name is written “Shiel;” in the article “Sanguinarin,” it is even 
t See “Annalen der Chemie und Pharmacie,” 1851; also the Report of the Amer- 
ie iation for the Advancement of Science, 1851. 
