TRADE specimens of “ fluid magnesia.” 
457 
Quantities of Magnesia dissolved in twenty-four hours, with the B. P. proportions under 
various pressures. 
Atmosphere. 
Mg 0. 
(MgC O s ) g MgO, 5 H 2 O). 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
15 
20 
1 fl. oz. 
») 
» 
5> 
JJ 
» 
5? 
» 
JJ 
2*1 grs. 
3- 6 „ 
4- 6 „ 
5- 4 „ 
6- 2 „ 
6- 5 „ 
6-6 „ 
f/7 „ 
7- 05 „ 
6 - 85 „ 
6-7 „ 
6-5 „ 
5-01 grs. 
8-59 „ 
10-98 „ 
12-88 „ 
14- 79 „ 
15- 51 „ 
15-75 „ 
15- 99 „ 
16- 82 „ 
16-35 „ 
15-99 „ 
15-51 „ 
Laboratory, 40, Aldersgate Street, E. C. 
TABLE OE STRENGTH OF TRADE SPECIMENS OF 
“ FLUID MAGNESIA.” 
BY PROFESSOR ATTFIELD. 
While recently endeavouring, with Mr. Moss, then Bell Scholar, now 
Junior Assistant in the Laboratory of the Pharmaceutical Society, to ascer¬ 
tain whether or not there existed a class of carbonates corresponding to the 
super-salts of the oxalic series,—compounds bearing the same relation to the 
acid carbonates that salt of sorrel does to acid oxalate of potassium,'—I had 
Table of Strength of Seven Trade Specimens of “ Fluid Magnesia .” 
Grains of Magnesia 
yielded by 1 fl. oz. 
MgO = 40. 
Grains of Official Carbo¬ 
nate per fl. oz. 
(3MgC0 3 , Mg2H0,4II 2 0) 
Divided by 4 = 95-5. 
Grains of Pure Carbo¬ 
nate of Magnesium in 
1 fl. oz. 
MgC0 3 , 3H a O = 138. 
r d 
'd 
<D 
TJ 
<U 
> 
■4-3 
CD 
o 
in 
in 
s 
m 
O 
Pi 
O 
Q 
Total 
solved 
w 
O 
Pi 
CD 
O 
Total. 
O 
m 
in 
• i—4 
a 
• rH 
OQ 
o 
Pi 
<D 
Q 
Total. 
No. 1 
2-29 
2-29 
5-48 
5-48 
7-92 
7-92 
2 
3-81 
3-81 
9-09 
909 
13-14 
13T4 
3 
1-77 
•07 
1-84 
4-23 
•16 
4-39 
6-11 
•23 
6-34 
4 
2-22 
2-22 
5-30 
5-30 
7-65 
7-65 
5 
3-51 
•84 
4-35 
8-38 
2-00 
10-38 
12-11 
2-90 
15-01 
6 
5-23 
•35 
5-58 
12-48 
•83 
13-31 
1803 
1-19 
19-22 
7 
3-88 
•14 
4-02 
9-26 
•34 
9-6 
13-38 
•5 
13-88 
The official strength 
= “ not less than ” 
5-00 
5-00 
11-94 
11 94 
17-25 
17-25 
But should be 
“ about ” 
5-50 
5-50 
13-00 
13-00 
18-98 
18-98 
Proposed strength 
4-20 
4-20 
10-00 
10-00 
14-45 
14-45 
3-35 
3-35 
8-00 
8-00 
11-56 
11-56 
2 it 
VOL. XI. 
