int ndrops = MAXDROPS, int n = -1) : Weather_effect(duration, delay, n),
int ndrops = MAXDROPS, int n = -1, Game_object *egg = 0) : Weather_effect(duration, delay, n, egg),
	Rain_effect(int duration, int delay = 0, 			int ndrops = MAXDROPS, int n = -1)		: Weather_effect(duration, delay, n),		  num_drops(ndrops)		{  }