Patent for a new and improved ventilating cover. This design "consists in the detailed construction of the same . . . whereby the contents of . . . vessels are protected from dust, insects, and all kinds of impurity, and at the same time are thoroughly ventilated by free communication with the atmosphere, and so that any gases arising from the contents of said vessels will not be confined with the contents, but will pass off through the ventilating-cover into the surrounding air" (lines 16-26).