His narrative is called the "Christian Topography of the Universe." It gives no details of its author's voyages, but begins with cosmographic discussions, to prove that the world is square, and enclosed in a great oblong coffer with all the other planets. This is followed by some dissertations on the function of the angels, and a description of the dress of the Jewish Priests. Cosmos also gives the natural history of the animals of India and Ceylon, and notices the rhinoceros and buffalo, which can be made of use for domestic purposes, the giraffe, the wild ox, the musk that is hunted for its "perfumed blood," the unicorn, which he considers a real animal and not a myth, the wild boar, the hippopotamus, the phoca, the dolphin, and the tortoise. Afterwards, Cosmos describes the pepper-plant, as a frail and delicate shrub, like the smallest tendrils of the vine, and the cocoa-tree, whose fruit has a fragrance "equal to that of a nut." From the earliest times of the Christian era there has been a great love for visiting the Holy Land, the cradle of the new religion. These pilgrimages became more and more frequent, and we have many names left to us of those who visited Palestine during the first centuries of Christianity. One of these pilgrims, the French Bishop Arculphe, who lived towards the end of the seventh century, has left us an account of his travels. He sets out by giving a topographical description of the site of Jerusalem, and describes the wall that surrounds the holy city, then the circular church built over the Holy Sepulchre, the tomb of our Lord Jesus Christ, and the stone that closed it, the church dedicated to the Virgin Mary, the church built upon Calvary, and the basilica of Constantine on the site of the place where the real cross was found. These various churches are united in one building, which also encloses the Tomb of Christ, and Calvary, where our Lord was crucified. Arculphe then descended into the Valley of Jehoshaphat, which is situated to the east of the city, and contains the church that covers the tomb of the Virgin; he also saw that of Absalom, which he calls the Tower of Jehoshaphat. He describes the Mount of Olives that faces the city beyond the valley, and he prayed in the cave where Jesus prayed. He also went to Mount Zion, which stands outside the town on the south side; he notices the gigantic fig-tree, on which, according to tradition, Judas Iscariot hanged himself, and he visited the church of the guest-chamber, now destroyed. [Illustration: Absalom's Tomb.]