In the course of an investigation of the effects of X-Rays on embryonic development of Melanoplus differentialis, it was noticed that abnormalities appeared in some of the individuals. More eggs were rayed, dosages comparable to those given the embryos in which abnormalities appeared, and the following observations have been made. (1) There was a critical stage for the production of abnormalities. Eggs rayed when the embryos were extremely young usually resulted in only deficiencies of various degrees. Eggs rayed when the embryos were just a few days older resulted in embryos exhibiting many abnormalities. Still older embryos produced no abnormalities following irradiation. (2) There was also an effective range of dosage. Too small a dosage gave no effects, too high a dosage caused cessation of growth and degeneration before abnormalities could be discerned.
Proceedings of the Iowa Academy of Science
©1935 Iowa Academy of Science, Inc.
Evans, Titus C.
"Some Embryonic Abnormalities Caused by X-Rays,"
Proceedings of the Iowa Academy of Science, 42(1), 207-208.
Available at: https://scholarworks.uni.edu/pias/vol42/iss1/97