What is comparative form of cold

In poem daffodils-how do we know that the yellow daffodils has a long lasting effect on the speaker.

What is implied in this sentence from mark twain's "the ? 1,000,000 bank-note"? i was puzzled, and wanted to discuss the matter a little further, but they didn't; so i took my leave, feeling hurt and insulted to be made the butt of what was apparently some kind of a practical joke, and yet obliged to put up with it, not being in circumstances to resent affronts from rich and strong folk.

Do postcards have any value? explain in full, not one sentence.