CONTENTS. 



Page. 



Woods called quebracho 5 



Distribution and supply of quebracho 5 



The quebracho tree 6 



Quebracho wood 6 



Uses of the wood 8 



General 8 



Crossties 8 



Tannin extract 8 



Importation of quebracho into the United States 9 



Substitutes for quebracho 10 



White quebracho (Quebracho bianco) 10 



Red quebracho (Quebracho Colorado) 11 



Key for the identification of quebracho wood and its substitutes 11 



ILLUSTRATIONS. 



PLATES. 



Page. 



PLATE I. The wood of quebracho. Fig. 1. Transverse section. Fig. 2. Tan- 

 gential section. Fig. 3. Radial section 12 



II. The wood of white quebracho. Fig. 1. Transverse section. Fig. 2. 



Tangential section. Fig. 3. Radial section 12 



TEXT FIGURE. 



FIGURE 1. Distribution of the quebracho tree 7 



33657 12 a 



