The mass consisted of rounded, semi-transparent, irregular grains, aggregated together into particles of various sizes.

All such particles, and the separate grains, possessed the power of rapid movement; generally revolving around different axes, but sometimes progressive.

The movement was visible with a very weak power, but even with the highest its cause could not be perceived.

It was very different from the circulation of the fluid in the elastic bag, containing the thin extremity of the axis.

On other occasions, when dissecting small marine animals beneath the microscope, I have seen particles of pulpy matter, some of large size, as soon as they were disengaged, commence revolving.