a)He believes it is stealthy and all-encompassing.
He describes the fog as being everywhere when he says its on the window-panes, in the drain pools, and "into the corners of the evening". All-encompassing means that it is everywhere, surrounding everything. The way the speaker leaves out any mention of sound or noise makes it seem as though this fog moves quietly. The description of the fog going to the window-panes, the corners, and the pools gives it a quick stealthy feel.
To make practical and effective use of.
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i.e: "vitamin C helps your body utilize the iron present in your diet"</u></h3>
it is called a domino effect, produced when one event sets off a chain of similar events
