L'Organisation de l'” f chez les chordés: étude d'embryologie causale

Abstract

THIS is an interesting exposition of modern work on the organisation of the egg in the Chordata. Beginning with the researches of Conklin on the normal development of Styela and of Amphioxus, the author proceeds to describe and discuss the development of isolated blastomeres of Ascidians and Amphioxus. He then gives an account of the normal development of Amphioxus and an analysis of the investigations designed to elucidate the organisation of the amphibian egg. The experimental work on the latter subject up to 1930 forms the subject of one chapter, which is followed by an admirable chapter of about sixty pages on the results in this domain published between 1930 and 1933. The tabular presentation and classification of the researches in the experimental embryology of Amphibia, especially of the Urodela, is useful. A chapter is devoted to a consideration of the organisation of the eggs of fishes, birds and mammals. In a final chapter, the views on ontogeny due to Gold-schmidt, Lillie and Wintrebert are presented and discussed.