code: public void addEmitter(ParticleEmitter emitter) {
  		emitters.add(emitter);
  		
  		ParticlePool pool= new ParticlePool( this, maxParticlesPerEmitter );
  		particlesByEmitter.put( emitter, pool );
  	}
docs: Add a particle emitter to be used on this system
  
  @param emitter The emitter to be added