"A, B, C, tunnelings of the carpenter bee; E, the carpenter bee; D, a partition; F, teeth, magnified"…
"Diagram to show thickening dome on both sides of the partition wall." — Encyclopedia Britanica,…
"Suppose the mirror, a b, to be placed on the side of a room, and a lamp to be set in antoher room,…
"Splitting of partition wall between guard-cells to form the stoma (Sachs.)" — Encyclopedia Britanica,…