Abstract
1. The dip-prism microscope has been improved to minimize movement, when the focus is adjusted.
2. With this microscope, monophasic positive spike potentials are always.recorded in the region of nerve fibers (axons) in the cat motor cortex.
3. On the other hand, in the region of the cell body, both positive-negative diphasic spikes and monophasic spikes are recorded sometimes with a slow potential component and an unstable base line.
