AmjJu0nUe^'i9oiarm'}    Developments  in  Organic  Compounds.  269 
A  disulfone  containing  'but.  one  ethyl  group 
CH3v  /SOo.CHg 
CH./  XS02.C2H5 
Ethyl-methyl-sulfone-di-methyl-methane 
produces  an  effect  only  half  as  intense  as  that  of  one  containing 
two  such  groups  as  sulfonal, 
CH  S02.C2H5 
CH./  XS02C2H5 
Diethyl- sulfone-di-methyl-methane. 
Again,  sulfonal  is  less  active  than  trional,  containing  three  ethyl 
groups. 
CH3  ^  y  S02  .  C2H5 
Diethyl  sulfone-methyl  ethyl-methane. 
Tetronal  (C2H5)2C(S02C2H5)2)  containing  four  ethyl  groups  is  more 
markedly  sedative  than  hypnotic.  An  interesting  fact  is  that  para- 
phenetol  carbamid  (Dulcin) 
(co/  ) 
V     \NH  —  C6H4OC2H/ 
is  sweet,  while  the  methyl  derivative  is  tasteless.  The  ethyl  group 
has  a  certain  fixed  relationship  to  the  nervous  system,  as  shown  by 
most  bodies  containing  the  ethyl  radical.  Ehrlich  has  found  that 
ethylated  colors  stain  the  nerve  cells,  while  those  containing  methyl 
groups  failed. 
CHLORIN. 
In  general  the  introduction  of  chlorin  in  aliphatic  compounds 
produces  bodies  of  a  more  or  less  narcotic  action  where  active  anti- 
septics result  if  the  substituted  body  belongs  to  the  aromatic  series. 
Too  extensive  a  substitution  will  develop  unpleasant  caustic  action. 
The  introduction  of  bromin  does  not  yield  compounds  of  any 
greater  antiseptic  value  than  those  produced  by  iodin. 
Iodin  imparts  to  all  . bodies  of  both  series  strong  antiseptic  prop- 
perties,  promoting  resorbtion  and  granulation.     The  substituted 
