...鸡血朱砂雄黄。拌针入活鲤鱼首。过同磁石收贮。取其准上午下子者用之。与雁胫之义不殊。凡羽禽之目。皆自下睫而交上睫。性皆升举。所以能飞。非若毛兽之目。悉自上睫而交下睫也。吾尝静观飞走升沉之理。于兹可默识矣...