[ 6m ] 
19,78 of this ftandard ; this therefore. is the quantity of ftandard 
in 100 parts of the cryftallized allum, ,The remainder there- 
fore of the 26,63 parts.refiduum juft mentioned, viz. 6,85 grs. 
are mere water retained by the ftandard acid.) ° 
Hence the proportion ab ingredients, in 100. parts cnyStallized 
allum is, dt .bion 3 y ft: 
Earth = .- =h2.o. nestinos 2! fe 29437 sets 
Standard acid st hodistas sy 19,78 
Water retained by the ftandaed cil - 6,85 
Water of cryftallization ||. - Lit> eyorrt4408 
ar : ig if ‘100,00 
or in other words, 100 parts allum contain _29;37 of earth, 
26,63 of acid, whofe fpecific tik 1180.1,7509, and 44: of water 
of -eryftallization. Le init od 
100 parts” burnt or calcined allum contain: about 52,3 of 
earth, 35,2 of ftandard acid, and 12,5 of water. 
i Accorpine to Mr. Bergman, Too parts ‘cryftallized allum con- 
‘tain 18 of earth, 38 of:acid, and -44 of water. It is probable 
he heated the earth to a very high degree, for in’a red ‘heat -it 
retains the fame weight as at 460°, but as to the quantity of 
acid it is certainly inferior to the weight he aligns, if Mi Wenzel's 
and my own can be relied on. 
Mr. 
