130         Prof.  W.  Weber  on  Electricity  in  relation  to 
observed  that  the  same  forces  as  those  which  determine  the 
states  of  aggregation  of  electricity  formed  by  simple  atoms  and 
by  atomic  pairs,  may  possibly  also  determine  similar  states  of 
aggregation  of  ponderable  bodies.  For  in  the  general  distribution 
of  electricity  it  must  be  assumed  that  an  atom  of  electricity 
adheres  to  each  ponderable  atom.  But  if  atoms  of  electricity 
adhere  firmly  to  ponderable  atoms,  nothing  will  be  altered  in  the 
relations  of  the  electrical  atoms  except  the  masses  which  have  to 
be  moved  by  the  forces  acting  on  the  electrical  atoms.  But  in 
the  preceding  developments  the  masses  are  left  undetermined, 
and  are  simply  denoted  by  e  and  e';  while  the  electrical  par- 
ticles themselves,  to  which  the  masses  e  and  e'  belong,  are  de- 
termined, without  a  knowledge  of  the  values  e  and  e',  by  the 
measurable  quantities  e  and  e'.  If  now  we  take  the  values  of  e 
ande'  so  great  as  to  include  the  masses  of  the  ponderable  atoms 
adhering  to  the  electrical  atoms,  all  the  results  that  have  been 
arrived  at  in  reference  first  of  all  to  electrical  atoms  merely,  may 
also  be  applied  to  the  ponderable  atoms  combined  with  the  elec- 
trical stoms. 
16.   On  the  state  of  Aggregation  and  Oscillation  of  two  dissimilar 
Electrical  Particles. 
In  the  case  of  two  dissimilar  electrical  particles,  the  same 
equations  hold  good  as  in  the  case  of  two  similar  particles, 
namely  those  of  section  11 ;  that  is  to  say, 
uu 
cc 
r0/p      r  +  r0   u0*0\ 
P     ^0  r  CC    /' 
y=  ee'[r-ro(P  ^  r  +  V"o"o\     1"| 
r  Lr—p  \r0  r         cc  )       y 
dJL-       ee'        [T°-P-(l       Sr~2P    r   r  \"Qao1 
dr~  (r-p)2L    rQ         V  rs    ~'r»r*)    cc  J' 
/l       ]\ee 
where  p  =  2(-  +  ~,J — ;  the  only  difference  is,  that  when  the 
particles  are  dissimilar  p  has  a  negative  value,  because  the  pro- 
duct ee'  is  negative.  Besides  these  equations  we  have  also  ar=a0r0 
(since  only  such  motions  are  considered  as  are  made  by  two  elec- 
trical particles  under  the  action  of  their  own  reciprocal  action), 
whence  there  follows,  lastly,  the  equation 
du  _  1  pec  dV      7oroaoao 
dt       2  ee1     dr  rs 
Hence  it  results  that,  as  in  the  case  of  two  similar  electrical  par- 
