Excerpt from Proceedings of the California Academy of Sciences, Vol. 1: Zoology, 1897-1899 The cover glasses are then at once placed with the film downwards on clean, dusted, blotting paper, and covered with a bell glass. This is absolutely necessary, as even under well closed bells some dust will penetrate and settle on the upper side of the glass. Afterwards these foreign substances may be mistaken for centrosomes, experience having shown me that through some cause or other these Specks of dust frequently settle in just those places where a centrosome is to be expected. After twelve hours or more of air drying, the cover glass is dropped into a shallow dish containing absolute alcohol, and allowed to remain two hours or longer. It may then be taken out and dried between blotting papers, after which it is ready for staining. Two points are important to observe: the blotting paper must be smooth and not corrugated; and after the glass has finally become dry it must be brushed off with a fine, clean, soft brush, in order to remove all the dust, which settles with astonishing rapidity, even in a few seconds. 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.