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Excerpt from The Effect of Cod Liver Oil and of Butter Fat Upon the Metabolism of Calcium and Phosphorous: Thesis for the Degree of Doctor of Public Health In the mean time Stepp in 1909 published his work. Mice fed on diets extracted with either and chloroform died within thirty days, whereas controls fed on the same without the either and chloroform extraction were living agter a period of six weeks. He also worked with pigeons and finally concluded that only certain lipins were necessary to supplement successfully a diet of purified food substances of the hitherto recognized group of ffiods. (5) 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.