Last evening we found time to go to the theatre. The opera was "Lucia de Lammermoor." The prima donna, La Rossi, has a voice of much sweetness, sings correctly and with taste, is graceful in her movements, but sadly deficient in strength. Still she suits the character represented, and comes exactly up to my idea of poor Lucy, devoted and broken-hearted, physically and morally weak. Though the story is altered, and the interest weakened, how graceful the music is! how lovely and full of melody! The orchestra is good, and composed of blacks and whites, like the notes of a piano, mingled in harmonious confusion.

The theatre is remarkably pretty and airy, and the pit struck us as being particularly clean and respectable. All the seats are red leather arm-chairs, and all occupied by well-dressed people.

At the end of the first act, we went round to the Countess F—-a's box, to return a visit which she had made me in the morning. We found her extremely agreeable and full of intelligence, also with a very decided air of fashion. She was dressed in fawn-coloured satin, with large pearls. At the end of the second act, Lucia was taken ill, her last aria missed out, and her monument driven on the stage without further ceremony. Montresor, the Ravenswood of the piece, came in, sung, and stabbed himself with immense enthusiasm. It is a pity that his voice is deserting him, while his taste and feeling remain. The house has altogether a French look. The boxes are private—that is, the property of individuals, but are not shut in, which in this climate would be suffocating. We passed out through a long file of soldiers. The sudden transition from Yankee land to this military Spanish negro-land is dreamy.

The General de la Marina (Anglice, admiral of the station) called some days ago, and informed us that there is a brig of war destined to convey us to Vera Cruz.

Amongst the ladies who have called on me, I find none more charming than the Countess de V—-a. Her voice is agreeable, her manners cordial and easy, her expression beautiful from goodness, with animated eyes and fine teeth, her dress quiet and rich. She is universally beloved here. I received from her, nearly every morning, a bouquet of the loveliest flowers from her quinta—roses, carnations, heliotrope, etc. The dinner at H—-a's to-day was a perfect feast. I sat between the Count de F—-a and the Count de S—— V——, a millionaire. Everything was served in French white and gold porcelain, which looks particularly cool and pretty in this climate. The Count de P—-r was there and his brother; the latter a gentlemanly and intelligent man, with a great taste for music, and whose daughter is a first-rate singer and a charming person. After dinner we rose, according to custom, and went into an adjoining room while they arranged the dessert, consisting of every imaginable and unimaginable sweetmeat, with fruit, ices, etc. The fruits I have not yet learned to like. They are certainly wonderful and delicious productions of nature; but to eat eggs and custards and butter off the trees, seems unnatural.

The heat to-day is terrible; with a suffocating south wind blowing, and were the houses not built as they are, would be unbearable. The dinner is served in the gallery, which is spacious and cool.

After dinner, Señor Don P—-o H—-a rose, and, addressing C—-n, pronounced a poetical impromptu, commemorating the late victory of Espartero, and congratulating C—-n on his mission to the Mexican republic. We then adjourned to the balcony, where the air was delightful, a cool evening breeze having suddenly sprung up. A large ship, full sail, and various barks, passed the View From the Balcony Morro. There were negroes with bare legs walking on the wall, carrying parcels, etc.; volantes passing by with their black-eyed occupants, in full dress, short sleeves, and flowers in their hair; well-dressed, martial-looking Spanish soldiers marching by, and making tolerably free remarks on the ladies in the volantes…. We had a visit from the Captain-General.

In the evening we went out to see the Countess de V—-a, at her pretty quinta, a short way out of town, and walked in the garden by moonlight, amongst flowers and fountains. The little count is already one of the chamberlains to the Queen, and a diamond key has been sent him by Queen Christina in token of her approbation of his father's services. These country retreats are delightful after the narrow streets and impure air of the city…. We saw there a good engraving of Queen Victoria, with the Duchess of Sutherland and Lady Normanby.

17th.—Yesterday we went to see the procession of the patron saint, San Cristobal, from the balconies of the Yntendencia. It is a fine spacious building, and, together with the Captain-General's palace, stands in the Plaza de Armas, which was crowded with negroes and negresses, all dressed in white, with white muslin and blonde mantillas, framing and showing off their dusky physiognomies.

Two regiments, with excellent bands of music, conducted the procession, composed of monks and priests. San Cristobal, a large figure with thick gold legs, surrounded by gold angels with gold wings, was carried by to the music of "Suoni la tromba," to which were adapted the words of a hymn in praise of Liberty.