unity variable from another script

//Make Health public
public class PlayerScript: MonoBehaviour {
  public float Health = 100.0f;
}

//Access it.

public class Accessor : MonoBehaviour {
    void Start()
    {
        GameObject thePlayer = GameObject.Find("ThePlayer");
        PlayerScript playerScript = thePlayer.GetComponent<PlayerScript>();
        playerScript.Health -= 10.0f;
    }
}