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By Louis Agassiz; Elizabeth Cary Agassiz

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From this time forward not only the class characters, but those of the family, begin to be distinguished. I will show you to-day how we may improve the classification of fishes by studying their embryology. Take, for instance, the family of Cods in its widest acceptation. It consists of several genera, among which are the Cod proper, the Cusk, and the Brotula. Naturalists may differ in their estimation of the relative rank of these genera, and even with referen"ce to their affinity, but the embryology of the Cod seems to me to give the natural scale.

To one, our record may not be lost. We must try not to mix the fishes of different rivers, even though they flow into f:lach other, but to keep our collections perfectly distinnt. You will easily see the vast importance of thus ascertaining the limitation of species, and the bearing of the result ou the great question of origin. " Something is already known. It is ascertained that the South American rivers possess some fishes peculiar to them. Were these fishes then created in these separate water-systems as they now exist, or have they been transferred thither from some other water-bed?

In those days the climate was some 24° or thereabouts below its present temperature. That is, the temperature of the present snow line then prevailed at a height of 7,000 feet above the sea level, as the present average temperature of Greenland then prevailed in lati tude 36°. I am as confident that we shall find these indications at about the limit I have pointed out as if I had already seen them. "* Although the weather is fine, the motion of the ship continues to be so great that those of us who have not what are popularly called" sea-legs," have mnch ado to keep our balance.

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