Figure 21, the Gregg Cabin, in the mountains of Caldwell County, is a further example of beautiful craftsmanship. The photograph shows changes that time has brought to the original house, but attention should be focussed on the lower walls in the foreground. Here the logs have been cut down to great planks, and so squarely cut that chinking seems almost unnecessary. The design of the corner joint, simpler than that of the Enos Blair cabin, is called “dove tail”—each plank ends with a shape something like the tail of a dove. Figures 22 and 23 show designs for double cabins—two cabins under one roof. The first idea, called the _Saddle-Bag_ cabin, has two rooms attached to one central chimney. This plan gets its name because it resembles two saddle bags hanging over the back of a horse. The second design, called the _Dog-Run_, has a chimney on each end, and an open breezeway—or dog run—through the center. This plan is also known as the _’Possum Trot_. No doubt the design was a favorite for large families, for it provided an out door play area for children in good weather and bad. [Illustration: FIGURE 21. THE GREGG CABIN, CALDWELL COUNTY.] [Illustration: FIGURE 22. “SADDLE BAG” CABIN, PLAN.] [Illustration: FIGURE 23. “DOG RUN” CABIN, PLAN.] Look back at the Gregg cabin (figure 21); by study of its roof line the plan of the cabin can be understood and named. Both the Saddle-Bag and the Dog-Run plans are simple—just two cabins under one long roof. It seems appropriate therefore, that they should be of simple log construction. Figure 24 is the John Knox cabin in Rowan County, built about 1752 but recently destroyed by fire. This illustration shows interesting developments in design. At first glance the structure does not seem to be a log house at all, but rather a medium sized clapboard house with a porch cut into one corner. But where the clapboards have been torn away one may see chinked log construction underneath. On the surface of this inner wall are vertical strips to which the clapboard siding is nailed. It is not uncommon for log structures to disappear beneath siding added at some later date. With the John Knox cabin we know the siding was added _after_ the porch and shed because the siding sweeps without break across the whole side of the structure. Olmsted noted this kind of cabin on his travels in South Carolina and was very appreciative of its features, which he described in some detail. In cabins of the better type, he said,