We hear that two shells have fallen into the house of Señor ——-, who has a pretty wife and a number of children, and that his azotea is occupied by the federalist troops. Fortunately, these grenades burst in the patio of his house, and no one was injured. The chief danger to those who are not actually engaged in this affair, is from these bullets and shells, which come rattling into all the houses. We have messages from various people whom we invited to come here for safety, that they would gladly accept our offer, but are unwilling to leave their houses exposed to pillage, and do not dare to pass through the streets. So our numbers have not increased as yet.

You may suppose, that although this is Sunday, there is no mass in the churches. The Prior of San Fernando, who has just sent us round some colossal cauliflowers and other fine vegetables from his garden, permits us to come to his convent for safety, should anything occur here, … I am afraid he would lodge the women-kind in some outhouse.

I had written thus far, when we received a visit from the Baron de ——-, ——- Minister, who, living in a very exposed situation, near the palace, requests us to receive his secretary of legation, M. de ——-, who is dangerously ill of typhus fever, as the doctors, no doubt warned by the fate of poor Dr. Plan, fear to pass into that street which is blocked up by troops and cannon. Some people fear a universal sacking of the city, especially in the event of the triumph of the federalist party. The Ministers seem to have great confidence in their flags—but I cannot help thinking that a party of armed léperos would be no respecters of persons or privileges! As yet our position continues very safe. We have the Alameda between us and the troops; the palace, the square, and the principal streets being on the other side of the Alameda; and this street, a branch of the great Calle de Tacuba, stretching out beyond it. I write more to occupy my thoughts than in hopes of interesting you; for I am afraid that you will almost be tired of this revolutionary letter. As a clever Mexican, the Marquis of ——-, says—"Some years ago we gave forth cries (gritos)—that was in the infancy of our independence—now we begin to pronounce (pronuncianos). Heaven knows when we shall be old enough to speak plain, so that people may know what we mean!"

Sunday Evening.—Monsieur de ——- has arrived, and is not worse. We have unexpectedly had twelve persons to dinner to-day. The news to-night is, that the government troops have arrived, and that a great attack will be made by them to-morrow on the rebels in the palace, which will probably bring matters to a conclusion. Some of our guests are sitting up, and others lying down on the sofa without undressing. I prefer being comfortable, so goodnight.

20th.—We were astonished this morning at the general tranquillity, and concluded that, instead of having attacked the rebels, the government was holding a parley with them, but a note from the English Minister informs us that a skirmish has taken place between the two parties at one of the gates of the city, in which the government party has triumphed. So far the news is good.

Our street has a most picturesque and lively appearance this morning. It is crowded with Indians from the country, bringing in their fruit and vegetables for sale, and establishing a temporary market in front of the church of San Fernando. Innumerable carriages, drawn by mules, are passing along, packed inside and out, full of families hurrying to the country with their children and moveables. Those who are poorer, are making their way on foot—men and women carrying mattresses, and little children following with baskets and bird-cages—carts are passing, loaded with chairs and tables and beds, and all manner of old furniture, uprooted for the first time no doubt since many years—all are taking advantage of this temporary cessation of firing to make their escape. Our stables are full of mules and horses sent us by our friends in the centre of the city, where all supplies of water are cut off. Another physician, a Spaniard, has just been shot!

Every room at San Cosme and in all the suburbs is taken. In some rooms are numbers of people, obliged to sleep upon mats, too glad to have escaped the danger to care for any inconvenience. A quantity of plate and money and diamonds were sent here this morning, which we have been hiding in different parts of the house; but they say that in cases of pillage the plunderers always search the most impossible places, pulling up the boards, brick floors, etc., ripping up the mattresses, and so on; so I believe there is no use in concealing anything. Near us lives a celebrated general, on whose political opinions there seems much doubt, as he has joined neither party, and has become invisible ever since this affair commenced. He is a showy, handsome man, with a good deal of superficial instruction, and exceedingly vain of his personal advantages. I am quite sure that, having allowed him to be a fine-looking man, he would forgive me for saying that his character is frivolous, and that his principles, both moral and political, are governed entirely by that which best suits his own advantage.

The Count de B——, secretary to the French Legation, mounted his horse last evening, and, like a true young Frenchman, set off to pay a visit to a pretty girl of his acquaintance, passing through the most dangerous streets, and particularly conspicuous by his singular dress, good looks, and moustaches. He had not gone far before he was surrounded by some dozen of léperos with knives, who would, no doubt, have robbed and despatched him, but that in tearing off his sarape they discovered his uniform, and not being very skilled in military accoutrements, concluded him to be an officer on the part of the government. They being on the federalist side, hurried with their prize to the palace, where he was thrown into prison, and obliged to remain until some of the officers came to see the prisoner, and recognized him, much to their astonishment.

We are now going to dine with what appetite we may, which is generally pretty good.

Ten o'clock, P.M.—We ventured out after dinner to take a turn in the direction opposite the city, and met various parties of ladies, who, as they cannot use their carriages at present, were thankful to escape from their temporary and crowded dwellings, and were actually taking exercise on foot; when we were encountered by people full of the intelligence that the great attack on the palace is to be made this evening, and were advised to hurry home. We were also assured that a party of léperos, headed by their long-bearded captain, an old robber of the name of Castro, had passed the night before our door. Before we could reach home the firing began, and we have passed several hours in a state of great suspense, amidst the roaring of the cannon, the shouting of the troops, the occasional cries of those who are wounded, and, to make everything appear more lugubrious, the most awful storm of thunder and rain I almost ever heard. The Señora de ——-'s brother is a captain in the government service, and he and his regiment have distinguished themselves very much during these last few days; consequently she is dreadfully uneasy to-night.