Congressional anti Senatorial Convcntions to be held at Pontiacon the 28th inst.- We understand that preparations are making for full Conventions; but no particulars have been communicated to us. V?= A .riM-rcnrnÃlfnt Ãn ÃTRnfiSPR Of)..writes us that the antislavery cause would be promoted by having the meetings of the A. S. Lecturers held in the country echool-houses, ratlier than in the villages exclusively. We agree with his suggestions, buthe wil! remember that the places of meetings are nppointed not by us, nor by the people of the Countics, but by tho Central Committee. To them he should npply. 05 Several Communications wero too late for this weck.