A, Unopened archegonium; o, ovum; ventral canal cell; k', nec k-canal-cell.
Until recently the vast subject of inter-metallic compounds has been an unopened book to chemists.
Against such a destiny D'Israeli's mind strongly revolted; and he carried his poem, with a letter earnestly appealing for advice and assistance, to Samuel Johnson; but when he called again a week after to receive an answer, the packet was returned unopened - the great Doctor was on his.
During the progress of the works, however, he acted as surveyor, and accumulated in that lucrative employment a sum of several thousand pounds, discovered after his death in an old iron chest, which had evidently lain unopened for above thirty years.
His mathematical enthusiasm was for the time completely quenched, and during two years the printed volume of his Mecanique, which he had seen only in manuscript, lay unopened beside him.
Archaeology has not yet found the key to every unopened door; but it has already done enough to justify the surmise that if criticism had not already disintegrated the traditional theories of the Old Testament, archaeology in the latter half of the 19th century would itself have initiated the process.