[46] "'Diachyma' is parenchyma in the middle of a leaf!" (Balfour, Art.
137.) Henceforward, if I ever make botanical quotations, I shall always
call parenchyma, By-tis; prosenchyma, To-tis; and diachyma, Through-tis,
short for By-tissue, To-tissue, and Through-tissue--then the student will
see what all this modern wisdom comes to!