Am  jour.  Pharm.  j     Romance  of  Chemical  Elements. 
July,  19 18.      }  * 
487 
bustion.  It  is  interesting  to  note  that  in  all  Teutonic  languages  the 
word  for  coal  is  derived  from  the  same  root  "kol,"  e.  g.,  in  German 
— kohle,  Dutch — kool,  Danish — kul,  Swedish — kol,  which  indicates 
1843 
i860 
1878 
1878 
1879 
1879 
1886 
1886 
1907 
1916 
1918 
Table  V. 
The  Family  Tree  of  the  Yttria  Earths. 
Year. 
Discoverer. 
1794 
New  base  in 
gadolinite  of  Ytterby 
1 
Gadolin 
1799 
Yttria 
1 
Ekeberg 
Erbia 
Terbia 
Yttrium 
No.  39 — Y 
At.  W.  88.7 
Terbia      j  Mosander 
Erbia 
Erbia 
I 
Ytterbium 
Holm'a 
Erbia 
Thulia 
Gadolinium 
Terbium 
Dysprosium 
Holmium 
Scandium  Ytterbia 
No.  21— Sc 
At.  W.  44.1 
Ytterbium 
(aldebaranium) 
I  'Lutecium 
>  ~-         >  cassiopeium 
Denebium  ■ — 
I  Dubhium  | 
I        I  I- 
Number  64 
Symbol  Gd 
At.  W.  157 
65 
Tb 
159 
66 
Dy 
162 
67 
Ho 
164 
68 
Er 
167 
69 
Tl' 
169 
70  71  72 
Tl"  Yb  Lu 
170      173  175 
Berlin 
Delafontaine 
Mariqnac 
Cleve 
Nils  on 
Mariqnac 
Lecoq  de 
Eoisbaudran 
Urbain 
(Auer  von 
We'sbach) 
Eder 
that  coal  was  known  to  the  Indogermanic  tribes  before  their  pre- 
historic separation.  In  Slavic  languages  we  find  in  Russian — ugoli. 
In  Hebrew  we  have  gehl.  The  term  carbon  is  derived  from  the 
Latin  "  carbon  "  =  coal,  which  probably  comes  from  the  Greek  dp<£w, 
arpho  =  to  char,  to  roast. 
