Excerpt from The Rat: Data and Reference Tables for the Albino Rat (Mus Norvegicus Albinus) And the Norway Rat (Mus Norvegicus) For a number of studies on the growth of the mammalian nervous system made by my colleagues and myself we have used the albino rat. In the course of the work we frequently felt the need of referring to other physical characters of the rat to which the nervous system might be related. This led us to col lect such data as were already in the literature and also led us to make further investigations. The facts gathered in this way have proved useful to us and are here presented in the hope that they will be useful to others also. The plan of the presentation is simple. An introduction treats of the rat as a laboratory animal, indicates the methods of gathering the data, and also gives examples of our use of the tables. This is followed by an outline of the classification of the common rats and by a brief statement of the history of the rat since it arrived in western Europe. The rest of the book falls into two parts. The first part deals with the domesticated albino rat - concerning which we have the larger amount of information. The second part deals in a similar way with the Wild Norway rat - the form from which the Albino has been derived. In connection with each part the several reference tables and the formulas employed for them and for the corresponding graphs, are-given, and at the end of the book a list of papers on the rat is added. In the two parts which form the body of the book the purpose is to present for the rat under normal conditions the funda mental observations - giving data and conclusions only. It is hardly necessary to add that in most directions our information is fragmentary. 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.