Destructive Fire.To add to tho distress occasioned at Cambridge by tho flood, on Saturday night last, the large Ware and Pork House of Sanford Lackey, of that place, got Are and was burned lo the ground, consuming an immense amount of Produce and Pork. We have not been able to Icarn the amount of loss sustained. It must have been immense, however, as there was a Canal boat laden with flour lying beside the Ware House, which, wi th its contents, was likewise consumed. It is thought to have been the work of on incendiary.