We have also visited the Diorama, the Georama and the Neorama, the royal printing office, the manufactory of plate glass and the hospital of the "Quinze Vingts." A diorama you have seen. A georama is a panoramic representation of the earth with its divisions of land and water; the spectator standing in the centre. A neorama is a painting so ingeniously designed and arranged, as to produce the illusion of your being within whatever building it represents. The one we saw is a picture of the interior of St. Peter's at Rome, and Mr. Dorval who has been there says it is an exact copy. The royal printing office is an establishment of great magnitude. There is a vast collection of types and several hundred presses. We were informed that Pope Pius VII visited this office during his sojourn in Paris, and that while he was there the Lord's prayer was printed in no less than 150 languages and presented to him. At the plate glass manufactory we beheld mirrors of wonderful magnitude. The plates are cast at Cherbourg and at St. Gobin, (a castle in the department of Aisne) and sent here to be quick-silvered and polished. Eight hundred workmen are constantly employed in the business. The French are indebted to the great Colbert for this establishment; prior to its foundation plate glass could only be had by sending for it to Venice. Having satisfied our curiosity here, we proceeded to the hospital of the "Quinze Vingts," founded by St. Louis in 1220 for the maintenance of 300 blind--a larger number is now admitted. It was customary in the age of St. Louis to count by twenties, and there being 15 twenties in 300 this institution derived its appellation from having that number of pensioners. We were pleased with the neatness and comfort that reigned, and arrived there just in time to hear a class of the blind sing and play; for those who evince a talent for music are instructed in it. The women were the vocalists and the men performed on various instruments. Even the leader was sightless! They kept time very well and we enjoyed their concert exceedingly, though the distorted faces some made while singing were horrible. They are taught a variety of trades, and not only reading but the art of printing, and we saw a man arrange the types and print several words with both skill and quickness. The types were extremely large and made of wood, and no ink was used in the operation, but the letters pressed on the paper, so as to leave the traces of them perceptible to the slightest touch.