Heat transfer is of paramount importance in wildland fire behavior and control. For a fire to start, heat must be transferred from a firebrand to the fuel. If the fire is to continue to burn and spread, heat must be transferred to the unburned fuel around the fire. And controlling a fire chiefly involves the prevention or slowing of heat transfer. Heart can be transferred in three ways-by conduction, by radiation, or by convection. Usually all three methods of heat transfer are operating at the same time in a wildland fire. In Heat-Part 1, we learned something of the nature of heat-what it is, how it is measured, and some of its characteristics. In the following discussion we will examine the process of heat transfer by conduction. Future reports will deal with the role of conduction in wildland fire and with heat transfer by radiation and convection. The level of difficulty of the treatment of topics in these publications varies, as signaled by the color of the cover: the blue cover group is generally elementary and the yellow cover group is intermediate.