There once stood a castle on the site of this garden, which remaining a long while uninhabited, was said to be haunted by frightful demons and apparitions; the whole neighborhood was nightly disturbed by them; no person would venture out after sunset, and finally the inhabitants were compelled, for the sake of rest, to seek other dwellings. In this state of things, the monks of a Carthusian monastery at Gentilly, (who were doubtless at the bottom of the mystery) promised to drive away the malicious spirits by exorcism, if St. Louis would grant them the castle and its appurtenances. Their request was complied with, and they so faithfully performed their part that peace was soon restored and the chateau converted into a convent, which existed about six hundred years. From the Luxembourg we proceeded through a long sunny avenue, to the observatory. On the left of the road, Arnaud our valet de place, pointed out the spot upon which Marshal Ney was shot. "Regardez, Mesdames! ce fut la (pointing with his finger) l'endroit ou le brave Maréchal Ney fut massacré--Jétais présent et il me semble que je le vois tout sanglant dans le moment," said he, shuddering. We paused to look at the once bloody spot, now verdant with grass and so sadly interesting. The observatory may be considered a wonderful building, for neither iron nor wood have been used in its construction; it is entirely of stone, each piece being ingeniously fitted to another. Four astronomers pursue their avocations here, and have the advantage of a good library and apparatus; there are, likewise, an anemometer for indicating the course of the wind, and a pluviometer for measuring the quantity of rain that falls at Paris. A geometrical staircase leads to the entrance of some spacious caverns where experiments in congelation are made, and these caverns communicate with subterranean galleries that were originally quarries, and extend a considerable distance under the city, containing beautiful stalactites, formed by water oozing through the rocks. We did not see them, for they cannot be entered without a special guide, and a written permission from certain persons appointed by government to superintend and inspect them. But my stars! I have exhausted nearly all my paper, and have yet a dozen places to describe! Well, well, you must be contented with an account of two of the most important; and by the time I have finished with them, I shall have to _squeeze_ in my name, no doubt. And now let me decide which of the various objects we have examined, I ought to regard as chief. Why, the mother church of France "Notre Dame," and the Pantheon, to be sure! The first is the most ancient religious structure in the city, and is pronounced to be one of the handsomest in the kingdom. Being built in the Gothic ages, its architecture is according to the fashion of those times, very singular and bold.--The interior of the building corresponds with the outside in curious