Fig. 10.-Narrow frames with steam heat. New Bern, N. C.

Fig. 11.-Lettuce growing in city lot. Fayetteville, N. C.

Fig. 12.-Lettuce frames on small suburban place. Fayetteville, N. C.

Fig. 13.-Lettuce culture in wide frames, showing heating and irrigating pipes. Truck Test Farm, Pender County, N. C.