How does the writer use language to create a sense of Hannay's discomfort?

Buchan uses simile and descriptive language to describe the narrator's thirst and the physical effects of hiding on the roof.

All that long blistering afternoon I lay baking on the rooftop. Thirst was my chief torment. My tongue was like a stick, and to make it worse I could hear the cool drip of water from the mill-lade. I watched the course of the little stream as it came in from the moor, and my fancy followed it to the top of the glen, where it must issue from an icy fountain fringed with cool ferns and mosses. I would have given a thousand pounds to plunge my face into that.

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