The Baptistery, which is a few years older than the Leaning Tower, is a stately rotunda, of huge dimensions, and was a costly structure. In it hangs the lamp whose measured swing suggested to Galileo the pendulum. It looked an insignificant thing to have conferred upon the world of science and mechanics such a mighty extension of their dominions as it has. Pondering, in its suggestive presence, I seemed to see a crazy universe of swinging disks, the toiling children of this sedate parent. He appeared to have an intelligent expression about him of knowing that he was not a lamp at all; that he was a Pendulum; a pendulum disguised, for prodigious and inscrutable purposes of his own deep devising, and not a common pendulum either, but the old original patriarchal Pendulum--the Abraham Pendulum of the world. This Baptistery is endowed with the most pleasing echo of all the echoes we have read of. The guide sounded two sonorous notes, about half an octave apart; the echo answered with the most enchanting, the most melodious, the richest blending of sweet sounds that one can imagine. It was like a long-drawn chord of a church organ, infinitely softened by distance. I may be extravagant in this matter, but if this be the case my ear is to blame--not my pen. I am describing a memory--and one that will remain long with me. The peculiar devotional spirit of the olden time, which placed a higher confidence in outward forms of worship than in the watchful guarding of the heart against sinful thoughts and the hands against sinful deeds, and which believed in the protecting virtues of inanimate objects made holy by contact with holy things, is illustrated in a striking manner in one of the cemeteries of Pisa. The tombs are set in soil brought in ships from the Holy Land ages ago. To be buried in such ground was regarded by the ancient Pisans as being more potent for salvation than many masses purchased of the church and the vowing of many candles to the Virgin.