Excerpt from Experiments With Drosophila Ampelophila Concerning EvolutionIn this paper only those families are considered which are in or close to the main line of descent. I have not thought it worth while to include any families having less than 40 Offspring unless they were in this main line. Typical data are given in table 36, page 31. I have tried to arrange these so that they will be available for further work by those interested. They should not, however, be used for more than they are worth. For example, one can not study the inheritance of fecundity from them, as in but few cases have I bred from a female until she died a natural death.All individuals, both parents and offspring, have been kept for refer ence and are deposited in the American Museum of Natural History. When of especial interest, the wings were mounted on glass slides in a thin layer of paraffin. This was found to be an excellent method of preservation. By all other methods which were tried the veins were rendered more or less transparent. When, as in making matings, it was desired to examine live ¿ies, they were slightly etherized. They completely revive in a few minutes. All examinations for abnormalities in wing-venation must be made with a lens.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.