Bui. 74, Bureau of Plant Industry, U. S. Dept. of Agriculture. 



Plate I. 



Fig. 1.— The Cane Cactus of Southeastern Colorado, Singed with Brush. 



Fig. 2.— The Prickly Pear of Texas. Singed with a Torch. 

 OLD AND NEW WAYS OF SINGEING CACTI. 



