. Radium . ^^^. L^ Fig. 12. Dorsal view of a normal untreated brain of an adult rat. Fig. 13. Dorsal view of the brain of an adult rat showing the marked devel- I^ADIUM 189 mental arrest in the formation of the neopallium. The meninges on the leftside of the brain are removed. Mother treated with gamma-ray irradiationon February 21, 1920, young were born on February 23rd. Brain from radiatedyoung removed on December 31, 1920. Dose = 1350 mc. hrs. (For furtherreference see text). The magnification is the same as for the drawing of thenormal brain. Fig. 14. A lateral view of the brain shown in F
. Radium . ^^^. L^ Fig. 12. Dorsal view of a normal untreated brain of an adult rat. Fig. 13. Dorsal view of the brain of an adult rat showing the marked devel- I^ADIUM 189 mental arrest in the formation of the neopallium. The meninges on the leftside of the brain are removed. Mother treated with gamma-ray irradiationon February 21, 1920, young were born on February 23rd. Brain from radiatedyoung removed on December 31, 1920. Dose = 1350 mc. hrs. (For furtherreference see text). The magnification is the same as for the drawing of thenormal brain. Fig. 14. A lateral view of the brain shown in Fig. 13. This shows the thin-ness of the remains of the cerebral cortex and its total absence in the frontaland occipital regions. (For further reference see text).
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