among mineralists, a species of lead-marcasite, by our miners called mock-ore, mock-lead, and wild lead, &c. The German mineralists call it blende, whence our denomination blinde. It answers to what in Agricola is called Galena inanis.

It usually lies immediately over the veins of lead-ore, in the mines which produce it, for it is not found in all. When the miners see this, they know the vein of ore is very near.

BLINDS, or BLINDES, in the art of war, a sort of defence commonly made of oziers, or branches interwoven, and laid across between two rows of stakes, about the height of a man, and four or five feet aunder, used particularly at the heads of trenches, when they are extended in front towards the glacis; serving to shelter the workmen, and prevent their being overlooked by the enemy.