I got a load of wood about a month ago. I blocked up about 4 cords of it within the first week. I mentioned to one of the local old timers yesterday that it was already showing cracks at both ends of each piece. He said that is why he doesn't buy machine cut wood, because all of the little pick marks in the wood allow all of the sap to evaporate out to quickly, resulting in the loss of heat. There is next to no bark left on most of this wood. Have any of you noticed any difference in drying or burning between machine processed wood, and wood that was harvested with a chain saw?