Excerpt from Bibliographical Contributions A plan for securing observations of the variable stars. Cambridge. 1882. Pp. 15. Statement of work done at the Harvard College Observatory during the years 187 7 1882. By E. 0. Pickering. Cambridge. 1882. Pp. 23. Circulars relative to the collection and distribution of astronomical intelligence. Cambridge. 1883. Pp. 7. First circular of instructions for observers of variable stars, acting in cc-operation with the Harvard College Observatory. [dated Cambridge, Jan. 27, pp. 4. Astronomical photography. [circular, dated Cambridge, Feb. 21, pp. 2. 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.