Excerpt from Report of the Canadian Arctic Expedition 1913-18, Vol. 4: Botany; Part A; Freshwater Algae and Freshwater Diatoms The low temperature in these northern latitudes makes it necessary to preserve all collections in alcohol almost immediately after they have been gathered. Alcohol, as is well known, is by no means a good fixing agent for algae and, as a consequence, the algae in the collections, for the most part, were poorly fixed. The protoplasmic contents of the cells were found to be much contracted and the walls of many of the desmids collapsed. Some of the desmids had even lost their original shapes, owing to the fact that portions of their walls had become inverted. In many of the Myxophyceae the alcohol had altered the colour of the sheath and of the contents. 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.