You may have read of the remarkable explorations of a Norwegian named Sigerson, but I am sure that it never occurred to you that you were receiving news of your friend. 

I then passed through Persia, looked in at Mecca, and paid a short but interesting visit to the Khalifa at Khartoum, the results of which I have communicated to the Foreign Office.

你也许看过一个叫西格森的挪威人写得非常出色的考察报告，我相信你决想不到你看到的正是你朋友的消息。然后，我经过波斯，游览了麦加圣地，又到喀土穆对哈里发作了一次简短而有趣的拜访，并且把拜访的结果告诉了外交部。

为什么最后一句results后的定语从句会出现介词of ？老师能否详解一下？可否去掉这个of 呢？