446     Properties  of  Electrically  Prepared  Colloidal  Solutions. 
recorded  in  Table  VIII.  The  specific  inductive  capacity  of 
ethyl  malonate  was  found  by  Nernst's*  method  for  slightly 
conducting  liquids. 
Table  VIII. — Values  of  V  in  volts. 
This  table  shows  a  surprisingly  close  agreement  among  the 
differences  of  potential  between  the  particles  and  the  liquids. 
Taking  into  account  the  wide  differences  between  the  specific 
inductive  capacity,  say  for  water  and  ethyl  malonate,  we  can 
deduce  that  the  charge  of  electricity  on  the  particle  of  a 
given  metal  must  he  much  greater  in  water  than  in  ethvl 
malonate  ;  in  other  words,  the  interaction  between  the  par- 
ticle and  the  solvent  seems  to  be  dependent  on  what  may  be 
defined  as  the  ionizing  power  of  the  liquid.  It  is  further 
interesting  to  note  that  these  values  for  the  differences  of 
potential  between  the  particles  and  the  liquids  are  of  the  same 
order  as  the  value  found  by  Perrin  for  the  difference  of 
potential  between  chromium-chloride  diaphragm  and  slightly 
acidulated  water  ("025  volt),  and  also  agrees  in  the  same  way 
with  Helmholtz's  values  for  the  difference  of  potential 
between  very  dilute  aqueous  solutions  and  the  walls  of  glass 
tubes  in  which  they  were  contained,  if  corrections  are  made 
by  introducing  the  value  for  the  specific  inductive  capacity 
of  water. 
X.    Conclusion. 
results    here    recorded 
have    the 
Summarizing    the    results    Jiere    recorded,    we 
following : — 
1.  The  size  of  the  diameters  of  the  particles  of  gold,  silver, 
and  platinum  in  electrically  prepared  colloidal  suspensions 
has  been  found  to  lie  between  the  limits  (2  —  6)  x  10-5  cms. 
2.  The  electro-negative,  non-oxidizable  metals,  gold,  silver, 
*  Zeit.f.phys.  Chemie,  vol.  xiv.  p.  622  (1694). 
