Excerpt from The Texas Mathematics Teachers' Bulletin, Vol. 7: February 8, 1922 Everyone but the geologist stresses the importance of the graph as a mathematical instrument to be used to represent the dependence of one quantity on another, or to picture statistical data. As a means of solving problems the graph as a tool is found very useful. Ratio, proportion, and varia tion, closely allied to the formula both in interpretation and as a method of solution, are listed as of considerable value by some, by others as essential. 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.