366 Chemical Notation of Laurent and Gerhardt. 
entire, replaces H, K, Zn. ‘The equivalent Fe% then communi- 
cates to the sulphatic system properties as different from those of 
the ferrous sulphate, as would be those of a sulphate containing 
any other metal. 
Again, in the mercurous and mercuric chlorids we have the 
same amount of chlorine united to different quantities of the 
metal. 
Mercurous chlorid, Hg, re 
Mercuric chlorid, Hg rf 
Hg, in the mercurous salts is the ae of H, K, Na, Pb, etc., 
and equally of Hg in the mercuric salts. Mercury has then ac- 
cording to our view, two equivalents (mercuricum and mercuro- 
sum), as compared. with other metals, which are to set other 
as 1 ; 2, and each one of these has its peculiar propert 
To show in the formulas that Fe, Hg., represent scjuivalel 
of H, K, Na, etc., we often replace the exponents by certain signs, 
employing the Greek letters «, 8, 7, and 3, in place of the num- 
bers 2, $, 4,4. The equivalents of H in ‘the following salts are 
then thus represented. 
Berzelian formulas. 
2-6 
Cu in the cupric salts. | Cu, or Cua in the cuprous salts. 
Hg omerduric:* Hg, or Hge “ mercurous “ 
3=8 
Fe in the ferrous salts. rig or Fe? in the ferric salts. 
Aw. © nai _ 
Cr “  chromous salts. ore orCr8 “ chromic “ 
Mn “ manganous “ MnorMnég « sapacacte ° 
~ 
Sn “ stannous salts. Sng or ard in the stannic salts. 
“  platinous “ Pt or ve “* platinic “ 
+= 
Bik or hee in the eae salts. 
Sb4 or Sbé timo 
Autor Aud “ ic 
Ata this plan of notation we write the formulas of these salts 
as fo 
Berzelian n notation. 
KO + Al "0,3 "980 24 aq. SO “KbA 6a 
Sulphate of potash, 50” shi ee Sletatat S04 K, BE }+6 89. 
Phosphate of soda P.O. 2Na0, H,0+424 aq. PO, (Na H)+12 aq. 
Riots pisoie Ps 50,, Na0, 2H,0-42 aq. PO, (Na H,)+a9. 
Ox; 
Phosphate of alumina, P, 0. ,Al,O, PO«(Al3 ) 
ois simplicity of the new notation is especially evident when 
to t i 
ural silicates. Take ion an example the clare of the chlorite 
