tion of marine life; and in our marine laboratories, explorers have studied the life history of the most useful forms.
The knowledge gained has enabled us to breed and multiply at will; to protect the young fish during the period of their infancy—when alone they are liable to wholesale destruction—finally to release them in the ocean, in those waters that are most suitable to their growth. The fecundity of fish is so great, and the protection afforded them during the critical period of their life so ample, that it may now be possible to feed the world from the ocean and set the laws of Matthews at defiance. Our geographers of the sea have shown that an acre of water may be made to produce more food for the support of man than ten acres of arable land. They have thrown open to cultivation a territory of the earth constituting three-quarters of the entire surface of the globe.
And what shall we say of our conquests in that other vast territory of the earth, greater in extent than all the oceans and the lands put together—the atmosphere that surrounds it.
Here again America has led the way, and laid the foundations of a Geography of the Air. But a little while ago and we might have truly said with the ancients "the wind bloweth where it listeth, and we know neither from whence it comes nor whither it goes"; but now our explorers track the wind from point to point and telegraph warnings in advance of the storm.
In this department, the Geography of the Air, we have far outstripped the nations of the world. We have passed the mob-period of research when the observations of multitudes of individuals amounted to little, from lack of concentrated action. Organization has been effected. A Central Bureau has been established in Washington, and an army of trained observers has been dispersed over the surface of the globe, who all observe the condition of the atmosphere according to a pre-concerted plan.
The vessels of our navy and the mercantile marine of our own and other countries have been impressed into the service, and thus our geographers of the air are stationed in every land and traverse the waters of every sea. Every day, at the same moment of absolute time, they observe and note the condition of the atmosphere at the part of the earth where they happen to be, and the latitude and longitude of their position. The collocation of these observations gives us a series of what may be termed instantaneous photographs of the condition of the whole atmosphere. The coordination of the observations, and their geographical representa-
