428 



Prof, Odling on the Natural Groupings 



Sulphydric acid. 



H^Se 



Et2 SeO ? 



CF Se02 



H^SeO^orffO.SeO^ 



H^SeO''orffO.Se03 



Et^TO 



Oxide of teUurethyle. 



CPT02 



H^TO^orH-O.TO^ 



H^TO^ovH^O.TOs 



CP SO"- 



Chlorosulphuric acid. 



H^SO^orlPO.SO^ 



Sulphurous acid. 



IPSO-^orffO.SO^ 



Sulphuric acid. 



In each of the above, and probably in all bihydrogenized com- 

 pounds, one or both atoms of hydrogen may be replaced by a 

 metal. 



The sulphides of hydrogen and alkaline metal are capable of 

 uniting with six atoms of oxygen to form the following series of 

 acids and salts : — 



H2S-2 06 

 H2 S3 o« 



H2S4 06 

 IP S^ 0" 



K^S 0« 

 K2 S2 0« 

 K^ S3 06 

 K^S^O^ 

 K2 S5 06 



Wanting. 



Hyposulphuric. 



Trithionic. 



Tetrathionic. 



Pentathionic. 



The corresponding oxides or anhydrides of sulphur, selenium 

 and tellurium, appear to resemble one another in properties :- 



Sulphm-ous anhydride SO- 

 Selenious .... SeO^ 

 Tellurous . . . . TO^ 



SO^ Sulphuric anhydride. 

 SeO^ Selenic. 

 TO^ Telluric. 



Corresponding compounds of sulphur, selenium and tellurium, 

 are isomorphous. The isomorjihism of oxygen with sulphur is 

 not well marked. The majority of the metallic sulphides, how- 

 ever, crystallize in the regular system, and are so far isomorphous 

 with the corresponding oxides. 



The number and variety of analogous compounds to which 

 sulphur and oxygen give origin are very great : — 



Suljjliuric acid . . 

 Seleuious anhydride . 

 Carbonic anhydride . 



Alcohol 



Potassic cyan ate . 

 Potassic carbonate . 

 Nitric oxide . . . 

 Potassic phosphate . 

 Phosphorus oxychloride PCPO 

 Red antimony . . SbOS^ 



IP SO^S Hyposulphnrous acid. 



SeS- Selenious sulphide. 



CS" Carbonic sulphide. 



C^IFS Mercaptan. 



CNKS Potassic suljjhocyanate. 



K^ CS^ Potassic sul])hocarbonate. 



N= S- Nitric sulphide. 



K^ PO'S Potassic sulphoxyphosphate. 



PCPS Phosphorus sulphochloride. 



SbS^ Antimony sulphide. 



The bodies IPO^ and H^ S" are binary molecules, HO. HO 

 and HS . HS respectively. HO is not, however, in any way 



SeO^ 



C0= 



C^IFO 



CNKO 



K^ CO^ 



N=02 



K^PO^ 



