* ee 
204 bl _ Scheerer on Isomorphism. 
least water a with the observance of certain precau- 
tions,* at the boiling point. This throws out a hint with refer- 
ence to the possibility of obtaining other salts of magnesia as 
well, wherein the quantity of water varies 
: $ ‘ eet Crop, 
= 
1. Fourfold hydrated, siesedetetihs : 2 
carbonate of magnesia, ce oe 43:39" 18°95 
to Trolle Wachtmeister a- 
. The same compound accordin 
sihoeelias ° 35-70 Ud 58 19-72 
3. Same compo, according to 2. 96.43 AA 412 19 75 
on. 
. Magnesi iaalba, according to Berzelius, 36°47 43-16 20-37 
5. Fivefold ‘hydrated, four-fifths-car- 
ig? * ‘Mg . 8 
Sui #3" 
bonate of magnesia, =e to 36:4 432 20-4 
Berzelius, . 
6. Same ae ind, according ae 365 42:8 20-7 
7. Magnesia alba, according to Rerzoliva, 37-00 42:24 20°76 
8. Magnesia alba, according to Butini, 36° 43 21° 
9. Fivefold. hydrated, four hfths-car- 
bonate of magnesia, according wt 36-22 42-10 21°68 
Fritzsche, 
10. Magnesia alba, according to Bucholz, 350 42> 23: 
The combinations arrived at by the chemists here named, cor- 
respond to the quaritities of oxygen stated below : / 
1. °27:38 / 16-80: 16-85", * 
: 5. 26°46 : 16-72 ; 18-13 ; ee 
6. 26:53 ¢ 16-57 :. 18-42 ie: 
: . 26°90 : 16-35: 18-48 pana 
8. 26:17 :.1664 ; 18-67 coe 
9. 26°33 : 16-29 ; 19-30 = oe 
10. 25-44 : 16-26 ; 20-47 i 
__ 
Mean 26°39 : 16°67 : a ‘B5 
This is an approxiination to the formula Me* C?+ AH, according 
to which the oxygen ratio should be 26°39 ; 17-59 : 17-59. Ap 
parently, therefore, the water contained in carbonates of magne- 
sia constituted as above, either does not act the part of a base at 
ie See Gmelin’s Handbuch der Chemie, New Edition, vol. ii, p. 224. 
