The maximum number of particles to emit.

var hSliderValue : float = 0.0;
function Update () {
	particleSystem.maxParticles = hSliderValue;
}
function OnGUI() {
	hSliderValue = GUI.HorizontalSlider(new Rect(25, 25, 100, 30), hSliderValue, 0.0F, 100.0F);
}

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    public float hSliderValue = 0.0F;
    void Update() {
        particleSystem.maxParticles = hSliderValue;
    }
    void OnGUI() {
        hSliderValue = GUI.HorizontalSlider(new Rect(25, 25, 100, 30), hSliderValue, 0.0F, 100.0F);
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	public hSliderValue as float = 0.0F

	def Update() as void:
		particleSystem.maxParticles = hSliderValue

	def OnGUI() as void:
		hSliderValue = GUI.HorizontalSlider(Rect(25, 25, 100, 30), hSliderValue, 0.0F, 100.0F)