51�Թ�

The attraction-spheres are generally large and conspicuous, sometimes consisting of a well-developed centrosphere, with or without centrosomic granules, at other times of very large centrosomes with a few astral rays.

Or when his admirers, anxious to improve on this, after distinguishing the atmosphere or air, the hydrosphere or water, the lithosphere or crust, and the centrosphere or interior mass, proceed to add that man is the most active portion of an intermittent biosphere, or living envelope of our planet, I cannot feel that the last word has been said about him.