262 Chemical Nomenclature of Berzelius. 
each produce four at least, of which one only in each case is a base. 
Cobalt produces ‘three, only one of which is a base. Iron gives 
three, two of which are bases.. Those sulphurets which are not 
bases and do not combine with other sulphurets, may without incon- 
venience be named according to their atomic constitution ; for ex- 
ample, bisulphuret,(46) sroulphubel, quadrisulphuret, perudahae 
ret of potassium, &c : the last degree contains five atoms of sulphur, 
the compound. - The sulphurets of iron,(47) are—the ferrous sul- 
phuret, the ferric sulphuret, and the bisulphuret of iron: those of 
cobalt are, the cobaltic sulphuret, the sesquisulphuret, and the bi- 
sulphuret of cobalt: those of potassium, sodium, ammonium, &e. 
are the potassic, sodic, ammonic, &c. sulphurets, the bisulphuret and 
trisulphuret, quadrisulphuret, and persulphuret of potassium, sodi- 
um, ammonium, §c. By putting the name of the metal in the geni- 
tive case when the sulphurets are not bases, they are easily distin- 
guished from those which are. 
that has been laid down in relation to the nomenclature of 
the compounds of sulphur, applies also to those of: selenium and tel- 
lurium. Oxygen, sulphur, selenium, and tellurium constitute a dis- 
tinct class of bodies, which form electro- -negative compounds (acids, 
sulphides, selenides, tellurides ») capable of combining with the elec- 
tro-positive compounds formed by the same bodies, (oxides, sulphu- 
= seleniurets, tellurets,) to produce salts. I shall call this class 
of simple bodies, amphigen(48) bodies. The bases may be distin- 
cnihid as oxybases, sulphobases, selenibases, telluribases. 
COMPOUNDS FORMED BY CHLORINE, BROMINE, IODINE, AND 
FLUORINE. 
The four bodies just named possess these common propertie ws 
Their combinations with the es gees metals are neutral salts 
(46) This supposes the existence of five Sempcicadla of sulphur with potassium ; 
ben first of these (t pa € potassic sulphuret) is a base; the su Iphur in the other four is 
n the ratio of 2, 3, 4 and 5, respe ctively, Berzelius admits two other sulphurets, 
‘eassbuade sciphaeh in the proportions of 33 and 4%, to the quantity contained in the 
potassic Sepscean — Frans, 
(47) Ferrous sulphuret, Ip of iron. The bisulphuret bears the 
same name in the English nomenclature. The sulphur in the three sulphurets is in 
the rtion nd 2, Heskits these Berzelius admits two subsulphurets of 
Let 4 
in the ferrous s sulphuret, — Trans 
~ 
(48 ) Am| x 
yt te inet et pig 
