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Explanation: "In writing it down I feel with only too much keenness the inadequacy of pen and ink--to express its quality."

He is having trouble translating those exact feelings into words despite his knowledge and prowess, and this shows that the experience observed first hand was rather magnificent and captivating.

And secondly, at the end, when the writer says that "after a time we ceased to do that, and looked only at the Time Traveller's face."

The fact that the story cast a spell and they stopped looking at each other also tells us something. These two excerpts show that the Time Traveller told a captivating tale.