Feeble-mindedness Preparations from the psychopathological division of the Vineland Laboratory. Upper Left. Simplicity of convolutions in a low-grade paralytic im- becile. Case 285 in Goddard's Feeblc-mhidcdness (reference 34). Age at death 44. Weight of cerebrum 006.5 g., left hemisphere 455.5 g., right 451.0 g.; cerebellum 122.0 g.; stem 25.6 g.; total weight 1054.1 g. Upper Right. Absence of corpus callosum in a middle-grade imbecile. Age at death 32. Lower Left. Hydrocephalic degeneration in a low-grade micro- hydrocephalic idiot. Total weight 712.1 g.; cerebrum 589.9 g.; cere- bellum 98.7 g. Age at death 14.6. Lower Right. Hydrocephalic degeneration in a low-grade, helpless, paralytic, micro-hydrocephalic idiot. The posterior lobes were totally disintegrated. Total weight 348.8 g.; cerebrum 264.3 g-; cerebellum