Excerpt from Royal Society of Health Journal Empiricism dies hard, and it is strange how slowly scientific knowledge spreads, even in the presence of an all-powerful Press and when the facilities for the diffusion of information have increased a thousandfold. But recently a gentleman in Mauritius gravely assured me that the appear ance of malaria in that island coincided with the introduction of guano from South America, and that this fever was undoubtedly due to the pernicious habit of manuring the cane fields with the dung of petrels and of penguins. 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.