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This will again be returned to the land as a by-product, which will not only maintain the fertility of the farm, but even increase it.

Dragut's lair was at the island of Jerba, which tradition links with the lotus-eaters, perhaps because of the luxuriant fertility of the soil. The people of Jerba, despite their simple agricultural pursuits, were impatient of control, and, as often as not, were independent of the neighbouring kingdom of Tunis or any other state.

They are the chief secret of the fertility of a soil; and the more there are of them the richer a soil is. This makes fourteen times as many deaths from typhoid in proportion to the population as occur in Germany.

The face of this region smiles with prosperity. In every direction the traveler rides astonished through a garden of plenty, equally impressed by the magnificent extent, and the profuse fertility of the estates, whose palm avenues, plantain orchards, and cane fields succeed each other in almost unbroken succession.

Another settlement had been formed, two years later, at Naumkeak, a tongue of land of remarkable fertility, where also a deserted Indian village was found, which formed the commencement of the town afterwards called Salem; and which had become at the period we have now arrived at in our story a place of some importance.

They come of the right race, too, as all the world knows colonists especially for honesty, sobriety, and patient industry. What a change for them from the inclement sky, the hostile winter, the rugged battle for life they have left behind them with their native Grampians, to this bright clime of everlasting summer, of strange fertility, to these sunshiny isles of beauty and plenty!

The final oxidation products of the carbon and hydrogen are carbon dioxid and water, which result from the decomposition of the carbonic acid. "Now the various acids of carbon and nitrogen constitute one of the most important factors in soil fertility.

On this view the fertility supposed to follow the application of fire in the form of bonfires, torches, discs, rolling wheels, and so forth, is not conceived as resulting directly from an increase of solar heat which the fire has magically generated; it is merely an indirect result obtained by freeing the reproductive powers of plants and animals from the fatal obstruction of witchcraft.

Nor is this nearly general and perfect fertility surprising, when we remember how liable we are to argue in a circle with respect to varieties in a state of nature; and when we remember that the greater number of varieties have been produced under domestication by the selection of mere external differences, and not of differences in the reproductive system.

Again, with respect to the fertility in successive generations of the more fertile hybrid animals, I hardly know of an instance in which two families of the same hybrid have been raised at the same time from different parents, so as to avoid the ill effects of close interbreeding.