410 Proceedings of the Royal Society of Edinburgh. [Sess. 
In the anterior portion of the archipallium the laminar arrangement 
is all but lost, the only sign of lamination which persists is an irregular 
and broken band of polymorphic cells in the same position as the band 
. \ \ 
Fig. 8. — Type VI. x 100. 
of larger cells described in the granular zone of the pyriform lobe. The 
remainder of the archipallium is composed of a homogeneous arrangement 
of granular and polymorphic cells. 
5. The Results of Electrical Stimulation of the Cortex.] 
For the investigation of the cerebral cortex unipolar stimulation was 
employed with the Berne induction coil. The strengths of current vary 
from *008 to *0104 and ‘0123 milliamperes as determined for me by Dr 
James Gray. 
As a result of electrical stimulation of the cerebral cortex of the guinea- 
pig, the motor area was located in the posterior half of the cerebrum. It 
