liThile  these  facts  may  overthrow  our  time-honored  con-

captions  of  matter,  they  are  in  perfect  harmony  with  tho

tHcory  of  molecular  a^regation  here  advanced.     It  is  not  at

^1  Qnrcaflonable  to  suppose  that  systcma  of  molecules  having

different  orbits  and  velocities,  and  different  forces  of  impact,

AliQnid  manifest  to  our  senses  entirely  different  properties,

'notwithstanding  that  we  ma;  know  that  the  same  molecules

*'^  present.    Indeed,  upon  this  theory,  tho  properties  of

"""tter  can  not  be  expected  to  remain  the  same  except  so  long

^*  the  mode  of  aggregation  remains  the  same.     So  far  aa

^^4e  properties  are  concerned,  it  is  the  mode  of  aggregation,

*^4  not  the  identity  of  substance,  which  constitutes  their

Jr^^nce.    'Without  activities  there  could  be  no  manifestation

^     jiroperties,  i.  e.,  no  properties;  and  with  each  change  of

^^^regation  must  come  change  of  activities,  ».  «.,  change  of

•"^apertiea.
