A lecture was last night delivered on Texas, at the Marylebone Literary and Scientific Institution, Edward Street, Portman Square, by Mr. Percy B. St. John, author of the "Trapper's Bride," "Enchanted Rock," &c. Mr. St. John is an enthusiast in everything relating to the success of Texan affairs, and has evidently entered with the spirit of one into the study of their history, as he has physically, into their struggle for "independence" in their war with the Mexicans. He served in that stirring struggle in the Texan navy, bat the materials of his lecture were chiefly gleaned from, and principally related to, the land service. The theatre of the institution was numerously and fashionably attended, a large portion of the auditory being composed of ladies. The lecturer commenced his discourse with interesting details of the early history of the Texans, in which were indicated many circumstances of stirring interest, He then directed attention to the Natchez, of whom he related some curious stories, and passed on to the conquest of South America by the Spaniards. He next directed attention to the Anglo-Saxon colonists, who soon became naturalised, and caught up the patriotic flame of American independence and American feeling, which they pushed with the indomitable energy and determination of purpose for which Englishmen, whether at home or on foreign shores, are distinguished. He next carried his audience on to the revolutionary war in which the country was engaged, and of which he gave a rapid and glowing sketch, pencilling its incidents of patriotism, hope, blood, treachery, &c-, in a very lively manner; and thence passed to the mercenary efforts of the Mexicans to subdue the Texans, and bring them under the Mexican yoke, narrating several instances of the treachery, baseness, and gross breaches of faith of Santa Anna and other mercenary soldiers engaged in that struggle. He then entered on a description of the extraordinary battle of San Jacinto, which ended in the achievement of Texan independence of the Mexicans, and the great distinguishing feature of which was the disparity of the antagonist forces, the Texans, who proved victorious, numbering but 750, while the Mexicans counted 4,000;  

the former commanded by the gallant General Houston, the latter by the experienced and daring Santa Anna. On the night before the battle the Texan forces, composed of all nations, English, Germans, Irish, Scotch, Italian, Polish, Swiss, French, Yankees, Dutch, &t., &c., presented a most singular and wild appearance as they grouped in conversation around their camp fires. They were most of them farmers' men, having a stake in the country, and who, setting their lives and liberties, their altars and their hearths on this last cast, had sent their wives and children into the United States for safety from the worst, should the worst befall, and the fates declare against them. Their boots were unpolished, their trousers unstrapped, their coats mostly of rough bear-skin unbrushed, and their hair and beards uncut for months, presenting as wild and singular a band as nature and rude warfare ever presented; yet most of those singular-looking men had been once accustomed, in the neat, fashionable, and well- appointed costume, to " grace the drawing- room" in European circles — most of them were polished gentlemen. The plan of battle was arranged — the Mexicans were in strong position; and at three o'clock in the morning General Houston gave the orders to advance towards the enemy, and to reserve their fire, not discharging a single shot until they should have come right front up with the foe, so as to be able to see "the whites of his eyes;" and with this firm set purpose the Texans advanced until they came within pistol range of the enemy's front, when they " let fly," scattering death and dismay throughout his ranks. The Mexicans reeled before the blow, and broke into confusion, the battle becoming sanguinary. The result was victory and independence to the Texian standard, the small band of 750 laying 700 Mexicans dead on the field, and taking 1,500 prisoners, and amongst them Santa Anna. Taken altogether, Mr. St. John's lecture on Texas was most instructive, and would have told much more effectively had it been delivered with less rapidity—a fault perhaps excusable when it is recollected that it was a first essay, and valuable for its matter. A second lecture takes place on Monday, May 11.—Morning Advertiser, April 28.