Excerpt from The American Journal of Science and Arts, Vol. 33 The cause assigned for this direction of comets' trains, by Pingre, namely, the resistance of the ether, appears not to have found much favour in the minds of his successors; consequently we find, in gen eral, the expression employed, namely, impulsion of the sun's rays, to denote both the agent and the manner of that agent's ao tion, in producing this result. 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.