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Abstract

(i) THE five articles which form this “Heft” are concerned with the technique of experimental embryology. In his account of micro-surgery Prof. Speniann deals with the operations for the examination of eggs—for dividing them either incompletely, e.g. by means of a looped hair, or by actually cutting the egg into two-with transplantation of parts of embryos to unusual positions, etc. Prof. Barfurth discusses the technique for the inquiry into heteromorphosis and regeneration in various groups of animals—embryos as well as adults. In this part Fig. 48 is printed without reference letters or description. Prof. H. Przibram gives methods for investigating the influence on development of heat, light, gravity, etc.; Dr. Karl Herbst deals with the methods of modifying development by means of various salts in solution, and Dr. Neumayer describes the instruments and technique of a number of operations. The work forms a useful source of reference for research workers and advanced students who desire to ascertain the methods which have been most successful in practice.

Handbuch der biologischen Arbeitstnethoden.

Edited by Prof. Dr. Emil Abderhalden. Abt. 5, Methoden zum Stadium der Funktionen der einzelnen Organe des tierischen Organismus. (1) Teil 3, Heft 1, Entwicklungsmechanik. Pp. 218. 66 marks. (2) Teil 3, Heft 2, Entwicklungsmechanik. Pp. 219–440. 72 marks. Abt. 9, Methoden zur Erforschung der Leistungen des tierischen Organismus. (3) Teil 1, Heft 1, Lieferung 34, Allgemeine Methoden. Pp. 96. 30 marks. (Berlin und Wien: Urban und Schwarzenberg, 1921.)