M. Agassiz had been away a little while previously, and left these treasures of his heart under the charge and superintendence of his assistant. This poor care-worn attendant, we were told, almost lost his own life in preserving the valuable existence of these little moving threads, so much did he feel the weighty responsibility that devolved upon him, and with such intense anxiety did he watch the complexions, the contortions, all the twistings and twirlings, and twitchings, and flingings and writhings of the wondrous little creatures, most assiduously marking any indications of _petite santé_ among them. They were kept in water carefully and frequently changed, and various precautions were indispensably necessary to be taken in order to guard their exquisitely delicate demi-semi existences. Glad enough was the temporary gentleman-in-waiting, and squire-of-the-body to these interesting zoophytes to see M. Agassiz return, and to resign his charge into his hands. With him this exceeding care and watchfulness was indeed nothing but a labor of love, and probably no nurse or mother ever fondled a weakly infant with more devoted tenderness and anxious attention than M. Agassiz displayed toward his dearly-beloved coral insects. As to me, I hardly dared breathe while looking at them for fear I should blow their precious lives away, or some catastrophe should happen while we were there, and we should be suspected of _coralicide_! However, the sight was most interesting. We watched them as they flung about what seemed their fire-like white arms, like microscopic opera dancers or windmills; but these apparent arms are, I believe, all they possess of bodies. How wonderful to think of the mighty works that have been performed by the fellow-insects of these little restless laborers. What are the builders of the Pyramids to them? What did the writers of the "Arabian Nights" imagine equal to their more magical achievements? Will men ever keep coral insects by them to lay the foundations of a few islands and continents when the population grows too large for the earthy portion of earth? People keep silkworms to spin that beautiful fabric for them; and M. Agassiz has shown there is no impracticability. I looked at the large bowl containing the weird workers with unflagging interest, till I could almost fancy minute reefs of rocks were rising up in the basin. What a world of marvels we live in, and alas that the splendid wonders of science should be shut out from so many myriads of mankind; for that the marvelous is inalienably dear to human nature, witness all the fairy tales, ghost stories, and superstitions of all kinds that have abounded and been popular from age to age. Penny Magazines and such works have done much, but much there remains to be done to bring the subjects not only within reach, but to make them more universally popular and attractive, and less technical.