THE distinguished zoologist in whose honour these volumes are issued is widely known as an indefatigable worker and one of the most genial of men. Together with the late von Kolliker, Prof. Ehlers has for many years edited the journal which now celebrates his seventieth birthday. As a testimony of the inspiring character of his teaching and of the regard in which he is held this “Festschrift” gives abundant witness. With no less clearness it indicates the diverse activities of modern zoologists and the particular problems upon which they are engaged. Zeitschrift fur wissenschaftliche Zoologie. Vols. lxxxii. and lxxxiii. Festschrift zur Feier seines siebzigsten Geburtstages am 11 Nov. 1905, Herrn Geheimen Regierungsrat Prof. Ernst Ehlers. Band i., pp. iv + 692; Band ii., pp. 741; and plates. (Leipzig: Engelmann, 1905.) 2 vols., price 5l.