Still more forcibly do we feel this impression when we discover in the early stage of their formation the yellowish white threads in which the sea makes her first outlines of the fuci and algæ which are to harden and darken to the strength and color of hides and leather. But when quite young, in their viscuous state, and in their elasticity, they have the consistence of a solidified wave, all the stronger because it is soft. What we now know of the generation and the complex organization of the inferior creatures, animal or vegetable, contradicts the explanation of Réaumur and the ancients. But all this does not forbid us to return to the question which was first put by Borg. de Saint Vincent; viz: What is the _mucus_ of the Sea? That viscuousness which water in general presents? Is it not the universal element of life? Much engaged with these and the like reflections, I called upon an illustrious chemist, a man at once positive and sound, an innovator no less prudent than bold, and I abruptly asked him this plain question--"What, in your opinion, is that whitish, viscuous matter which we find in sea water?" "Nothing else than life," was his reply, then retracting, or rather explaining his somewhat too simple and too absolute dictum, he added, "I should rather say a half organized and wholly organizable matter. In certain waters it is a dense mass of infusoriæ, in others a matter which is not yet, but which is to become infusoriæ. In fact, we have yet to begin, at all seriously, the study of this matter." This was spoken on the 17th of May, 1860.