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Excerpt from The Growth of the Body and Organs in Albino Rats Fed With a Lipoid-Free Ration
Two examples will serve to illustrate this procedure. They are taken from table 3 - C, normal males, 1914 series: (1) On the 'mixed ration' the average tail length for the three rats is 172 mm., for the given body length, 196 m. We expect from the reference tables a tail length of 165 mm. The observed value is therefore plus per cent. The two rats on the lipoid-free diet and egg fat give a tail length of 151 mm. For a body length of 168 mm. From the reference tables we should expect a tail length of 139 mm. The observed value for the tail length of the experimented group is therefore plus per cent. The difference between these two percentage shows the tail length in the experimented group to be or per cent greater than that of the controls. This is the value given in table 3. (2) Taking the brain weights for the groups just used we find by following the method employed above for the tail length, that the group on the mixed ration has a brain weight per cent below the reference table value, while the group on the lipoid-free ration plus egg-fat has a brain weight which is per cent deficient. Thus the brain weight in the experimented group is 6.4.1ess or per cent lower than in the controls. This is the value entered in table 2. All the percentage differences in the accompanying tables have been obtained in a manner similar to that illustrated by the two examples just given. The only modification in procedure to which attention need be drawn is in the cases where the data from two series, 1913 and 1914, have been combined. In those cases the percentage deviation which is given in the table is the mean of the devia tions for each series computed separately. 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.
