TANNING MATERIALS 



65 



The following table, furnished by the Tanners' Council of the United 

 States, shows the approximate quantity of tanning materials consumed 

 annually in this country: 



TANNING MATERIALS CONSUMED CALENDAR YEAR 1918 



Material. 



Chestnut 



Hemlock 



Oak 



Quebracho 



Wattle • 



Mangrove 



Myrobalans 



Gambier 



Sumach 



Valonia ' 



Divi divi 



Larch 



Quercitron ' 



Algarobilla ' 



Quermos ' 



Not specified 



Runaway or recovered extract ^ . . . 

 Blended (chestnut and oak only) ^ . 

 Sulphite cellulose ' 



Solid Extracts, 

 Pounds. 



48,148,878 

 2,952,660 

 3.815-056 



79,137,089 



154,013 



1,405,26s 



124,583 



782,512 



1,080,110 



10,120 



500,514 



243,483 



3,726 



1,950 



2,580 



3,048,623 



84,620 



17,000 



194,094 



Liquid Extracts, 

 Pounds. 



316,229,621 



17,442,192 

 34,380,396 



94,371,395 

 36,792 



45,891 



188,908 



225,236 



1,670,909 



100 



89,101 



2,049,208 



18,722 



64,690 



28,464,866 



9,776,692 



4,938,616 



6,185,361 



Crude Tanning 



Material, 



Pounds. 



74,794,423 

 723,077,392' 

 485,134,791 

 2,989,851 

 2,200,452 

 5,764,495 

 6,719,494 

 3,176,398 



5,930,990 



7,008 



13,217,926 



900 



10,433 



5,335,272 

 1,018,824 



1 Figures obtainable for January-May only. Other months probably included in " Not specified." 



2 Figures cover July-December inclusive only. Other months probably included in " Not Speci- 

 fied." 



=• Figures cover August-December inclusive only. Other months probably included in " Not 

 Specified." 



CHROME TANNING MATERIALS 



Pounds. 



Bichromates 13,344,547 



Other chrome compounds 8,239,942 



PRODUCTION OF HEMLOCK BARK 



Hemlock bark has for a long time constituted the principal source of 

 tanning materials used in this country, and has been commonly employed 

 in tanning leathers ever since the beginning of the industry in America. 

 The nearest competitor was oak bark, the annual consumption of which, 

 however, has been for many years less than one-half that of hemlock bark. 

 Oak bark has been particularly preferred by some tanners from the 

 earliest days of the industry largely because it has been associated in 



