The Muil Steamer Caledonia arrived at Boston on the 19th instant, from Liverpool via Halifax, having made the passage in fourteen days, incliiding the detenlion at Ilalifax. She brings London and Liverpool dates to the3dinst. Tlie majority obtained in the House of Lords, on the 28th uit., on the second reading of the Corn Bill, has given great satisfaction throughout England ; and is believed ihat the suspense in which mcrchants and tradershave been kept, by the uncertain position of the Corn Bul, and which operatcd so injuriously on trade, iaving been removed by this vote, an impulse wil) irntnedialely bc given to cvery branch of trade. The London Morning Chronicle of the 2d inst. rcmarks, tlmt much interest was matiifested in the city, to see the eiTcct the divisiÃ³n on the Corn Bill would produce on the market at Mark LaÃ±e. "Con triry to all expectations, the supplies werc moderate, the pricos were firmly maintaincd. and if any diiFerenco could be, it was certainly not in favor of the buyer. And this is the more singular considering the great combinutiou of circumstatices calculated to induce a lower price." The news from France is not important; but from Algcria we learn ihat Ab delKader had ordcred thrco hundtcd French prisoners to be shot, and his order was obeyed. This news created a greut sensation in Paris. The weather in England has been remarkably fine, ami the growing crops promise to be unusualiy abundant. The Morning Ilerald of the 3d says, "We are enabled to state that Lord Aberdeen has intiinated to Mr. M'Lane, the American Minister in London, that our government have determiuedto ofler theii mediation for the arrangement of all dif fcrences between Mexico and the Unitcc States. The necessarv instructions ancfull powcrs wjll be fonvarded to Mr. Packenham by tho Caledonia steamer. - Thia is a matter of vory great importanco, and every friend of liumanity and justice must'anlenlly dcairo that the mediation mav have a successful result. lt is furthei understood thjat our governrnent have aAcertained that the offer of tnÃediation will not be unacceptable to the Executive of the United States. Ikei.and. - The use of lndian meal has now become quite general ihroughoul the country, and the people prefer it to the potato, the uniform price of which, for some months past, had placed it beyond the rÃ©ach of the Inboring classes. FiiANCE, Taris, Juno 1. - The political news from F ranee is not particularly interesting. The most important item is to be found in Ln Press, which announca, that ordci3 had been sent by the Minister of marine to Brest, and the olhBf military harbors, todespatch the number of ships of warto the Gulf of Mexico to reinforcÃ¶ the squadron stationedg there, in consequence of the war be tween the United States and Mexico. - H On tliia subject much uneasineÃ©s exista in Paris. The opposition prints are all on the side of America, and predict an early conquest of AZuxico by the United States. The apprehension caused by the war with the United States with Mexico weigheo on the Paris money market on the let inst. The Arabs have taken terrible revenge for the barbarity perpetrated by the French, some time ago, in roasting their soldiers in the caverns. It is rumored Abd-el-Kader recently ordered the massacre of all the French prisoners in Jhe Deira, numbering some three hundred, and that this order was carried into effect. The reason assigned for this act is, that the Morocco troops were advancing on all sides agninsl the Deira, and that Abd-el-Kader, for the purpose of comrnittiug to his cause Algerine tribes, who had eniigrated with him into 3Iorocco, 1 had ordored his prisoners, with the ex ception of his officers, to be shot.