Descriptive Catalogue of the Embryological Models (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from Descriptive Catalogue of the Embryological Models

The spawning period commences in early spring, towards the end of March, and continues throughout the summer. The eggs are laid by the female in the evening, about an hour after sunset, and are fertilised at once by spermatozoa shed over them by the male. Development commences about an hour after fertilisation is effected, and proceeds with great rapidity: by sunrise on the following morning the embryo has reached the stage shown ih-model 13, at which period it works its way out of the egg membrane, and swims freely. Twenty-four hours later it has reached the stage shown in models 23 to 25: and a few hours later still, i.e., about thirty-six hours from the time of fertilisation, the mouth and first gill cleft are formed.

The extreme rapidity with which the early stages of development are passed through is to be associated with the very small size of the egg, and the small amount of food yolk present in it.

About the Publisher

Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com

This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Die Inhaltsangabe kann sich auf eine andere Ausgabe dieses Titels beziehen.