It is known to our readers, says the* Homestead, that Professor Johnson has been employed in the examination of the mucks, peats, and swamp deposits of our State. We have been publishing from time to time such of his results as he has deemed desirable to furnish, to awaken interest and secure the attention of farmers to their own advantages, which might otherwise have been neglected. A large number of peats, etc., have been examined, and now he is ready to make up his report to the State Society.

Coal and Iron have been formed, according to the most modern ideas of science, thus: - as the earth's crust cooled down from its state of incandescence, incalculable quantities of free oxygen must have been withdrawn from the air, and imprisoned in the oxydization of its mineral elements, with a force which no subsequent natural agency, at any rate upon a large scale, has been able to loosen! The vegetation which supervened, stimulated to high luxuriance by the fine bottom heat and reeking atmosphere of those times, began to repair this loss by decomposing the carbonic acid of the air, and thus increasing the relative amount of its oxygen. Thus the beds of iron ore and of coal, which accompany and overlie each other on the earth's wind, have withdrawn from the original atmosphere, the one a portion of its oxygen, the other a portion of its carbonic acid. When we would obtain the former in its primitive and useful state, we mingle the ore with the coal, and drive off the oxygen, surcharged with carbon, again into the air from which both originally came, by the aid of the heat which the vegetables that gathered the carbon had absorbed from the sun's rays.

The idea that plants absorb light and heat - a true force, from the sun, as well as that they constitute a deoxydizing apparatus, reducing the ozydized products of animal life - is claimed by Dumas and Boussingault. The latter promulgated the opinion that plants absorb light and caloric, only so lately as in the year 1837.

It is now a familiar fact, that plants are the great, the sole, producers of animal life. They alone convert the materials furnished chiefly by the atmosphere; they condense air into organized matter. While plants thus produce on such a grand scale, they consume or destroy comparatively little. Even when they do consume their own products, it is not in the mere vegetation, but in the accomplishment of some special results, chiefly in flowering. They often seem to consume, when they only transform and transfer. When they apparently consume the nutritive matter accumulated in the root of the Carrot, for instance, or the tuber of a potato, they in fact transform it, for the most part, into branches, foliage, and flowers. Animals consume what vegetables produce. When the farmers along oar sterile coast manure their exhausted lands with fish, they merely reclaim their own and bring back to the soil what has been washed into the sea. The earthly portion of the animal's bones, and the iron in his blood, are equally drawn ready formed from the earthly constituents of the vegetables upon which he feeds. The animal merely accumulates these materials, changing them, it may be, little by tittle, as he destroys them, but giving them all back, finally, to the earth and air.

Literally, then," all flesh is grass." The wants of the animal kingdom were all prospectively provided fur, when to them was "given every green herb for meat." One of the modes of fishing in China, according to Mr. Fortune, is curious; the men wade into the water, and strike a harp below upon the surface with their hands. This frightens the fish, which dive into the mud, and the moment the Chinaman feels one touch his feet, he himself dives also, and soon reappears holding up his prey with an air of triumph.