The animals were deeply anesthetized and then perfused through the
heart with saline followed by formol-saline solution. The brains were
blocked in the coronal stereotaxic plane posterior to the lunate sulcus
and were then removed from the head, photographed, and allowed to
sink in a sucrose formalin solution. The brains were cut in 50 Frn sections
on a freezing microtome. Every fifth section was retained and stained
with cresyl violet. The series of sections from each animal was examined
microscopically. Illustrative sections from one monkey are shown in
Figure 1. The other 2 monkeys were similar