The trip was magical ; the stuff of which dreams are made.

the stuff of which dreams are made=the stuff whose dreams are made=the stuff the dreams of which are made.
定语从句中：whose+物= of whch the +物=the+ 物 of which这一句dreams前面没有the。好奇怪啊。请问为什么要加the？也就是说：The house _______ windows face south is our reading-room.为什么不能填of which？应看作：the stuff of which这句话感觉有点问题，不解dreams。下面的句子肯定是没有the的原因。那一句的翻译：那一次的旅行，宛如梦境。请问这个与the有什么关系。答案也是说这里windows前没有the所以不用of whcih，为什么？