spherule

Considerable areas may sometimes be seen without any yolk-spherule whatever.

What can be more widely contrasted than a newly-born child and the small gelatinous spherule constituting the human ovum?

Lastly, I must tell you about the color of the blue sky which was illustrated by the spherule embedded in an elastic solid.

Imagine the solid to extend miles horizontally and miles down, and imagine this spherule to vibrate up and down.

It is supposed to be of chemical origin, each spherule being an aggregation of particles round a central nucleus.