Wright, Chauncey, 657.
Wright, G. F., Letters to, 655, 666, 684, 695.
Wyman, J., 303, 327, 502, 505, 511, 550, 553, 600.

Xantus de Vesey, L. J., 466.
Xantus, Californian Plants, 466.

Yale College Lectures, 693, 694, 699, 700.

Zuccarini, J. G., 25, 234, 235, 315.
Zygodon, Bones of, 303.