506 



APPENDIX. 



3. Potash- Sulphate of Copper. 



1 atom sulphate of potash 

 1 atom sulphate of copper 



6 atoms water 



4. Potash- Protosulphate of Iron. 



1 atom protosulphate of iron 



1 atom sulphate of potash 

 5 atoms water 



5. Potash- Sesquisulphale of Iron. 



2 atoms persesquisulphate of iron 

 1 atom sulphate of potash 



25 atoms water 



6. Potash-Persulphate of Iron. 



1 atom persulphate of iron 



1 atom sulphate of potash 



2 atoms water 



7. Potash- Sulphate of Magnesia. 



1 atom sulphate of potash 



1 atom sulphate of magnesia . 



7 atoms water 



8. Potash- Sulphate of Manganese. 



1 atom sulphate of potash 

 1 atom sulphate of manganese 



5 atoms water 



9. Potash- Sulphate of Nickel. 



1 atom sulphate of potash 

 1 atom sulphate of nickel 



6 atoms water 



10. Potash-Sulphate of Zinc. 



1 atom sulphate of potash 



1 atom sulphate of zinc . 



7 atoms water 



16 



