…One day a gentle breeze from the north sprang up and stirred the orange branches, wafting the heavy perfume across the land and out to sea, and spread in its stead a cool, delicate, pungent odour. The Cardinal lifted his head and whistled an inquiring note. He was not certain, and went on searching for slugs, and predicting happiness in full round notes: "Good Cheer! Good Cheer!" Again the odour swept the orchard, so strong that this time there was no mistaking it. The Cardinal darted to the topmost branch, his crest flaring, his tail twitching nervously. "Chip! Chip!" he cried with excited insistence, "Chip! Chip!"

The breeze was coming stiffly and steadily now, unlike anything the Cardinal ever had known, for its cool breath told of ice-bound fields breaking up under the sun. Its damp touch was from the spring showers washing the face of the northland. Its subtle odour was the commingling of myriads of unfolding leaves and crisp plants, upspringing; its pungent perfume was the pollen of catkins.

Up in the land of the Limberlost, old Mother Nature, with strident muttering, had set about her annual house cleaning. With her efficient broom, the March wind, she was sweeping every nook and cranny clean. With her scrub-bucket overflowing with April showers, she was washing the face of all creation, and if these measures failed to produce cleanliness to her satisfaction, she gave a final polish with storms of hail. The shining river was filled to overflowing; breaking up the ice and carrying a load of refuse, it went rolling to the sea. The ice and snow had not altogether gone; but the long-pregnant earth was mothering her children. She cringed at every step, for the ground was teeming with life. Bug and worm were working to light and warmth. Thrusting aside the mold and leaves above them, spring beauties, hepaticas, and violets lifted tender golden-green heads. The sap was flowing, and leafless trees were covered with swelling buds. Delicate mosses were creeping over every stick of decaying timber. The lichens on stone and fence were freshly painted in unending shades of gray and green. Myriads of flowers and vines were springing up to cover last year's decaying leaves.
This essay is developed primarily through which type of supporting evidence?