Enemy Health With Raycast Not Working

I have a gun script and an enemy health, but the enemy isnt taking damage when it should be. can anyone tell me whats wrong?

ENEMY

 var Health : float = 10;
 
 function Start()
 {
 
 }
 
 function ApplyDammage (Damage : int)
 {
     Health -= Damage;
     
     print("1");
     
     if(Health <= 0)
     {
         Dead();
         print("2");
     }
 }
 
 function Dead()
 {
     Destroy (gameObject);
 }

GUN

 var Effect : Transform;
 var Damage = 1;
 
 var Cam : Camera;
 
 function Start()
 {
     stopSpread = spread;
 }
 
 function Update () 
 {
     /*Shooting*/
     
     var hit : RaycastHit;
     var ray : Ray = Cam.ScreenPointToRay(Vector3(Screen.width*0.5 + (Random.Range(-spread, spread)), Screen.height*0.5 + (Random.Range(-spread, spread)), 0));
     
     if (Input.GetMouseButtonDown(0))
     {    
         if (Physics.Raycast (ray, hit, 500))
         {
             var particleClone = Instantiate(Effect, hit.point, Quaternion.LookRotation(hit.normal));
             Destroy(particleClone.gameObject, 2);
             hit.transform.SendMessage("ApplyDamage", Damage, SendMessageOptions.DontRequireReceiver);
         }
     }
 }

Thanks in advance!