are shown to have been open to receive foreign ideas? The three arguments on which Humboldt principally relied to prove that a communication had existed between the east of Asia and the Mexicans may be explained without adopting his theory that the Nahuatls had travelled round from the old world. The remarkable resemblance of the Mexican and Tibeto-Japanese calendars might result from the accidental stranding of a Japanese or Chinese vessel on their shores, bringing to them some man learned in the astronomy of the old world. The correct orientation of the sides of their pyramidal temples was but the result of their great astronomical knowledge and of the worship of the sun. And the resemblance of their traditions of four epochs of destruction and of the dispersion of mankind after a great flood of waters, arose from the fact that the great catastrophes that befell the human race at the melting of the ice of the glacial period were universal over the world. CHAPTER 21. Return to Santo Domingo. The birds of Chontales. The insects of Chontales. Mimetic forms. Departure from the mines. Nicaragua as a field for emigration. Journey to Greytown. Return to England. HAVING finished our business at Masaya, we rode back to Granada on the evening of the second day, and the next morning took a passage in a fine steamboat that Mr. Hollenbeck, of Greytown, had placed on the lake to convey passengers and goods between Granada and San Carlos, at the head of the river San Juan. We arrived at San Ubaldo at two o'clock, and found our mules safe but foot-sore, through travelling over the rocky hills from Santo Claro. The San Jose plains were in a dreadfully muddy state, and for five miles we went plunging through the swamps. Most of the mules fell several times, and we had great difficulty in getting them up again. We passed two travellers with their mules up to their girths in mud, and incapable of extricating themselves, but could not help them, as we dared not allow ours to stand, or they would stick fast also. We had met, at San Ubaldo, the son of Dr. Seemann, on his way home to England. His pack-mule had stuck fast in the plains the night before, and he had passed the night sitting on his boxes, half sunk in the mud, and attacked by myriads of mosquitoes that had covered his hands, face, and neck with blisters.