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In the description of night in Macbeth, the beetle and the bat detract from the general idea of darkness - inspissated gloom.

In James Boswell 'The Life of Samuel Johnson' (1791) vol. 2, p. 90 (16 October 1769)
In the description of night in Macbeth, the beetle and the bat detract from the general idea of darkness - inspissated gloom.