Excerpt from The Boston Medical and Surgical Journal, Vol. 184: June 9, 1921 By this method one can exhibit on the same chart the differences of age group distribution of deaths from cardiac disease, such as angina pectoris, with not more than 400 deaths at any one age group, and deaths from organic heart disease with at the same age group. If we plot statistical curves of widely different magnitudes on the same drawing, and if our object is to compare not only the amounts of increase or decrease but the percentage rates of change, there is only one correct method the semi-logarithmic chart. The almost uniform number of deaths from acute endocarditis at each age group up to 55, and then the sharp drop, and the quite similar curve of pericarditis deaths contrast sharply with the sky-rocket curve of angina pectoris in the age groups over 15 years, and the more gradually mounting curve of organic heart dis ease to the age group 60-65. 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.