12 BULLETIN 466, U. S. DEPARTMENT OF AGRICULTURE. 



TANNIN REACTION. 



A test for the presence of tannin was made in all of the samples 

 by the ferric chlorid reaction as described in Bureau of Chemistry 

 Bulletin 134, page 18. 



RESULTS OF ANALYSIS. 



The results of analysis of the samples, given in Table X, are 

 arranged by States and counties. The location of the county in 

 the State is shown by the usual symbols, namely, □ center, -Q west 

 of center, J2 southwest of center, etc. The results of the chem- 

 ical examination have been calculated to the dry basis for better 

 comparison. Averages have been made for the samples from the 

 individual States, from Canada, and from the United States as a 

 whole, as well as for all of the samples collected. 



